Suppose the teenagers that attend public high schools get an average of 5.7 hours of sleep each night with astandard deviation of 1.7 hours. What is the probability that a randomly selected group of 35 high school studentsget more than 6 hours of sleep each night?0.43000.28110.14800.1492

Mean service life is 5.7 and a standard deviation is 1.7. Sample size 35.

Answered: Suppose the teenagers that attend…

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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Suppose times for the 100m sprint for the average person are unimodal and symmetric with mean 14 seconds and standard deviation 0.8 seconds. What is the probability that the average person has a time faster than Usain Bolt's record of 9.58 seconds?
Suppose that an airline has a requirement that male members of the cabin crew are between 62 inches and 73 inches tall. Assume that men have normally distributed heights, with a population mean height of 69 inches, and population standard deviation of 2.4 inches. What is the probability that a randomly chosen man will be too short (shorter than 62 inches) or too tall (taller than 73 inches) to be a member of the cabin crew for this airline?
Suppose that the number of hours that an adult watches in a day has a mean of 2.4 hours and a standard deviation of .7 hours. i. What is the probability that an adult watches more than 3.5 hours in a day?Calculate the z-score. Draw a diagram, Then find the probability.ii. What is the probability that a person watches between 2 and 3 hours of TV a day? Write the probability notation. Calculate the z-score. Draw a diagram. then you may find the probability.iii. What is the 40th percentile for the number of hours an adult watches TV in a day?
The Australian Emergency department reports that the average time it takes to respond to an emergency call is 20 minutes. Assume the variable is approximately normally distributed and the standard deviation is 5 minutes. If 80 calls are randomly selected, what is probability a emergency call will be responded between 12 and 25 minutes?
A government sample survey plans to measure the total cholesterol level of an SRS of men aged 20-34. suppose that, in fact, the total cholesterol level of men aged 20-34 follows the normal distribution with a mean of 182 milligrams per deciliter. The standard deviation is 37 milligrams per deciliter. choose an SRS of 1000 men from this population. Now what is the probability that x falls within + or - 2 milligrams per deciliter of the mean?
A certain mobile app has a mean delay for messaging of 75 ms with a standard deviation of 4.5 ms. Suppose eighty one people used this app within the past 5 minutes. Find the probability that the average delay for messaging exceeds 76 ms. a. 0.4772 b. 0.0228 c. 0.1293 d. 0.3707
3. The finish times for marathon runners during a race are normally distributed with a mean of 195 minutes and a standard deviation of 25 minutes. What is the probability that a runner will complete the marathon within 180 minutes?
Suppose the heights of a group of people follow a normal distribution with a mean of 170 cm and a standard deviation of 10 cm. If 25% of the people are shorter than 160 cm, what is the minimum height required to be in the tallest 10% of the group? If a sample of 50 people is randomly selected from the group, what is the probability that their average height is between 168 and 172 cm?
2. The number of pages in a PDF document you create has is randomly distributed between 5 and 9 pages, where all values are equally likely. What are the mean and standard deviation of the number of pages in the document2
Suppose the heights of students in a class follows normal distribution. The mean is 66 inches and the standard deviation is 5 What is the probability that a randomly selected student height is above 69 inches? What is the probability that the height will fall in between 45-54 inches? Which of the following intermediate step is involved in finding probability that a randomly selected student height is more than 70 inches?
An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are normally distributed with a mean of 119 cm and a standard deviation of 5.7 cm. A. Find the probability that one selected subcomponent is longer than 121 cm. Probability = B. Find the probability that if 4 subcomponents are randomly selected, their mean length exceeds 121 cm. Probability = C. Find the probability that if 4 are randomly selected, all 4 have lengths that exceed 121 cm. Probability =
Suppose that the number of gallons of milk sold per day at a local supermarket are normally distributed with mean and standard deviation of 424.7 and 21.47, respectively. What is the probability that on a given day the supermarket will sell above 440 gallons of milk?

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