The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 23 minutes and a standard deviation of 6 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 20 minutes, (b)between 23 and 31 minutes, and (c) more than 30 minutes.(a) The probability that a randomly selected athlete uses a stairclimber for less than 20 minutes is(Round to four decimal places as needed.)←

We are going to find the probability by the help of z scores, calculate z scores of each then find…

Answered: he amounts of time per workout an…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Similar questions

The height of 10 year old females is normally distributed with a mean of 54.8 inches and a standard deviation of 2.74 inches. If a random 10 year old female is chosen at random, find the probability her height is between 53 inches and 57 inches.
Assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find the probability of a bone density test score between −1.59 and 1.59.
Assume the readings on thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. Find the probability that a randomly selected thermometer reads between -0.61 and 1.91.
Assume that adults have IQ scores that are normally distributed with a mean of μ=100 and a standard deviation σ=15. Find the probability that a randomly selected adult has an IQ between 89 and 111.
The heights of students are normally distributed with mean 161 inches and standard deviation of 4.56 inches. Find the probability that the probability of height is less than 165 inches?
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 125.6-cm and a standard deviation of 1.1-cm. For shipment, 15 steel rods are bundled together.Find the probability that the average length of a randomly selected bundle of steel rods is between 124.7-cm and 125.3-cm.P(124.7-cm < M < 125.3-cm) = _________Enter your answer as a number accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
An airline has two flights each day from City A to City B. A random sample of 10 morning flights left the gate an average of 15 minutes late with a standard deviation of 5 minutes. A random sample of 10 evening flights left the gate an average of 20 minutes late with a standard deviation of 3 minutes. Suppose both the morning and evening flights are 30 minutes late. To determine which flight is more late than usual, first find the z-scores. Round to one decimal place if necessary.
Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard deviation σ=20. Find the probability that a randomly selected adult has an IQ between 93 and 117.
Assume that the readings on the thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A thermometer is randomly selected and tested. Find the probability that the reading is between 1.5°C and 1.71°C.
The height of Christmas trees are normally distributed. The standard deviation of Christmas trees is 200 inches and the mean height is 1400 inches. What is the probability that a randomly selected Christmas tree is between 1100 and 1438 inches?
The annual income for a sample of 450 part-time students is normally distributed with a mean income of $31,000 and a standard deviation of $3,000. What is the probability their annual income is $22,000-$28,000? Do not use Excel Use Z SCORE
Adult males have a mean weight of 179 lbs with a standard deviation of 29 lbs. Find the probability that a random sample of 36 men will have a mean weight less than 176 lbs

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