Elementary Technical Mathematics
11th Edition
ISBN: 9781285199191
Author: Dale Ewen, C. Robert Nelson
Publisher: Cengage Learning
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Chapter 13.5, Problem 20E
To determine
To calculate: The coordinates of the center of eight equally spaced
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A computer repair shop has two work centers. The first center examines the computer to see what is wrong, and the second center repairs the computer. Let x₁ and x2 be
random variables representing the lengths of time in minutes to examine a computer (✗₁) and to repair a computer (x2). Assume x and x, are independent random variables.
Long-term history has shown the following times.
01
Examine computer, x₁₁ = 29.6 minutes; σ₁ = 8.1 minutes
Repair computer, X2: μ₂ = 92.5 minutes; σ2 = 14.5 minutes
(a) Let W = x₁ + x2 be a random variable representing the total time to examine and repair the computer. Compute the mean, variance, and standard deviation of W.
(Round your answers…
Answer this two questions:
2 . We roll seven 20-sided dice, numbered 1 to 20. Show that it is always possible to find two disjoint nonempty subsets of the dice such that the sums of the shown faces of the dice in each of the subsets coincide(only one of the faces is considered to be shown) .
4. We are given a deck of 60 cards, 40 are identical black cards, 10 are identical red cards, and 10 are identical greenc ards. How may ways are there to deal the 60 cards to three distinct players so that everyone gets exactly 20 cards?
The acidity or alkalinity of a solution is measured using pH. A pH less than 7 is acidic; a pH greater than 7 is alkaline. The accompanying data represent the pH in samples of bottled water and tap
water. Complete parts (a) and (b).
Click the icon to view the data table.
(a) Determine the mean, median, and mode pH for each type of water. Comment on the differences between the two water types.
Select the correct choice below and fill in any answer boxes in your choice.
A. For tap water, the mean pH is
(Round to three decimal places as needed.)
B. The mean does not exist.
Data table
Тар
Bottled
7.64 7.45 7.46 7.50 7.68
7.45 7.10 7.56 7.46 7.52
5.15 5.09 5.31 5.20 4.78
5.52 5.31 5.13 5.31 5.21
7.69
7.46
5.23
5.24
Print
Done
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Chapter 13 Solutions
Elementary Technical Mathematics
Ch. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Prob. 5ECh. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Prob. 7ECh. 13.1 - Refer to right triangle ABC in Illustration 1 for...Ch. 13.1 - Prob. 9ECh. 13.1 - Refer to right triangle ABC in Illustration 1 for...
Ch. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Prob. 13ECh. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Prob. 15ECh. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Prob. 17ECh. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Prob. 20ECh. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Prob. 23ECh. 13.1 - Use right triangle ABC in Illustration 1 and the...Ch. 13.1 - Use the triangle in Illustration 2 for Exercises...Ch. 13.1 - Use the triangle in Illustration 2 for Exercises...Ch. 13.1 - Prob. 27ECh. 13.1 - Use the triangle in Illustration 2 for Exercises...Ch. 13.1 - Prob. 29ECh. 13.1 - Use the triangle in Illustration 2 for Exercises...Ch. 13.1 - Prob. 31ECh. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Prob. 33ECh. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Prob. 37ECh. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Prob. 41ECh. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Prob. 43ECh. 13.1 - Prob. 44ECh. 13.1 - Find the value of each trigonometric ratio rounded...Ch. 13.1 - Prob. 46ECh. 13.1 - Prob. 47ECh. 13.1 - Prob. 48ECh. 13.1 - Find each angle rounded to the nearest tenth of a...Ch. 13.1 - Find each angle rounded to the nearest tenth of a...Ch. 13.1 - Prob. 51ECh. 13.1 - Find each angle rounded to the nearest tenth of a...Ch. 13.1 - Prob. 53ECh. 13.1 - Find each angle rounded to the nearest tenth of a...Ch. 13.1 - Prob. 55ECh. 13.1 - Find each angle rounded to the nearest tenth of a...Ch. 13.1 - Prob. 57ECh. 13.1 - Prob. 58ECh. 13.1 - Prob. 59ECh. 13.1 - Prob. 60ECh. 13.1 - Prob. 61ECh. 13.1 - Prob. 62ECh. 13.1 - Find each angle rounded to the nearest hundredth...Ch. 13.1 - Prob. 64ECh. 13.1 - Find each angle rounded to the nearest hundredth...Ch. 13.1 - Prob. 66ECh. 13.1 - Find each angle rounded to the nearest hundredth...Ch. 13.1 - Prob. 68ECh. 13.1 - Prob. 69ECh. 13.1 - Prob. 70ECh. 13.1 - Prob. 71ECh. 13.1 - Prob. 72ECh. 13.1 - Prob. 73ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 5ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 7ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 9ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 17ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 19ECh. 13.2 - Using Illustration 1, find the measure of each...Ch. 13.2 - Prob. 21ECh. 13.2 - Prob. 22ECh. 13.2 - Prob. 23ECh. 13.2 - Prob. 24ECh. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Find the unknown sides of each right triangle (see...Ch. 13.3 - Prob. 11ECh. 13.3 - Prob. 12ECh. 13.3 - Prob. 13ECh. 13.3 - Prob. 14ECh. 13.3 - Prob. 15ECh. 13.3 - Prob. 16ECh. 13.3 - Prob. 17ECh. 13.3 - Prob. 18ECh. 13.3 - Prob. 19ECh. 13.3 - Prob. 20ECh. 13.3 - Prob. 21ECh. 13.3 - Prob. 22ECh. 13.3 - Prob. 23ECh. 13.3 - Prob. 24ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 3ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 9ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 11ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 13ECh. 13.4 - Prob. 14ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 16ECh. 13.4 - Prob. 17ECh. 13.4 - Prob. 18ECh. 13.4 - Prob. 19ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.4 - Prob. 21ECh. 13.4 - Prob. 22ECh. 13.4 - Prob. 23ECh. 13.4 - Using Illustration 1, solve each right triangle:...Ch. 13.5 - A conveyor is used to lift paper to a shredder....Ch. 13.5 - A bullet is found embedded in the wall of a room...Ch. 13.5 - The recommended safety angle of a ladder against a...Ch. 13.5 - A piece of conduit 38.0 ft long is placed across...Ch. 13.5 - Find the width of the river in Illustration 4....Ch. 13.5 - Prob. 7ECh. 13.5 - A smokestack is 180 ft high. A guy wire must be...Ch. 13.5 - A railroad track has an angle of elevation of 1.0....Ch. 13.5 - Prob. 10ECh. 13.5 - Enrico has to draft a triangular roof to a house....Ch. 13.5 - A small plane takes off from an airport and begins...Ch. 13.5 - A gauge is used to check the diameter of a crank-...Ch. 13.5 - Round metal duct runs alongside some stairs from...Ch. 13.5 - The cables attached to a TV relay tower are 110 m...Ch. 13.5 - Prob. 16ECh. 13.5 - Prob. 17ECh. 13.5 - Prob. 18ECh. 13.5 - Use the right triangle in Illustration 13: a. Find...Ch. 13.5 - Prob. 20ECh. 13.5 - Twelve equally spaced holes must be drilled on a...Ch. 13.5 - Dimension x in the dovetail shown in Illustration...Ch. 13.5 - Find angle of the taper in Illustration 17....Ch. 13.5 - You need to use a metal screw with a head angle of...Ch. 13.5 - Prob. 25ECh. 13.5 - Prob. 26ECh. 13.5 - Find length x and angle A in Illustration 21....Ch. 13.5 - From the base of a building, measure out a...Ch. 13.5 - A mechanical draftsperson needs to find the...Ch. 13.5 - Prob. 30ECh. 13.5 - Prob. 31ECh. 13.5 - Prob. 32ECh. 13.5 - Solar heating and electric panels should face the...Ch. 13.5 - A lean-to is a simple shelter with three walls, a...Ch. 13 - For Exercises 1-7, see Illustration 1....Ch. 13 - For Exercises 1-7, see Illustration 1....Ch. 13 - Prob. 3RCh. 13 - For Exercises 1-7, see Illustration 1....Ch. 13 - Prob. 5RCh. 13 - Prob. 6RCh. 13 - Prob. 7RCh. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find angle A in Illustration 2. ILLUSTRATION 2Ch. 13 - Find angle B in Illustration 2. ILLUSTRATION 2Ch. 13 - Find side b in Illustration3. ILLUSTRATION 3Ch. 13 - Prob. 17RCh. 13 - Prob. 18RCh. 13 - Solve each right triangle:Ch. 13 - Prob. 20RCh. 13 - A satellite is directly overhead one observer...Ch. 13 - A ranger at the top of a fire tower observes the...Ch. 13 - Find the angle of slope of the symmetrical roof in...Ch. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find the value of each trigonometric ratio rounded...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find each angle rounded to the nearest tenth of a...Ch. 13 - Find angle B Illustration 1. ILLUSTRATION 1Ch. 13 - Find side a Illustration 1. ILLUSTRATION 1Ch. 13 - Find side c Illustration 1. ILLUSTRATION 1Ch. 13 - Find angle A Illustration 2. ILLUSTRATION 2Ch. 13 - Find angle B Illustration 2. ILLUSTRATION 2Ch. 13 - Find side b Illustration 2. ILLUSTRATION 2Ch. 13 - A tower 50.0 ft high has a guy wire that is...Ch. 13 - Find length x in the retaining wall in...Ch. 13 - Find angle A in the retaining wall in Illustration...
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