According to the Sleep Foundation, theaverage night's sleep is 6.80 hours.Assume the standard deviation is 0.60hours and that the probabilitydistribution is normal. What is theprobability that a randomly selectedperson sleeps at least 6.20 hours?Select one:O a. 0.0668O b. 0.1587Ос.0.9192O d. 0.9641Ое.0.0359Of.0.8413O g. 0.0808O h. 0.9332

Answered: Image /qna-images/answer/004caaf1-adba-428c-bc40-7b195afb1239.jpg

Answered: According to the Sleep Foundation, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The lifetime of a particular brand of AA batteries follows a normal distribution. The mean lifetime of particular brand of AA batteries is 1000 hours, with a standard deviation of 100 hours. What is the probability that a randomly selected battery lasts more than 875 hours? Select one: a. 0.8716 b. 0.3749 c. 0.1056 d. 0.8944
The Bank of Connecticut issues Visa and MasterCard credit cards. It is estimated that the balances on all Visa credit cards issued by the Bank of Connecticut have a mean of $840 and a standard deviation of $260. Assume that the balances on all these Visa cards follow a normal distribution.a. What is the probability that a randomly selected Visa card issued by this bank has a balance between $1050 and $1420?Round your answer to three decimal places.P= Enter you answer in accordance to the item a) of the question statementb. What percentage of the Visa cards issued by this bank have a balance of $735 or more?Round your answer to two decimal places.P= Enter you answer in accordance to the item b) of the question statement %
Assume that the height of a type of tree has a normal probability distribution with a mean of 85.9 ft and a standard deviation of 9.4 ft. A tree of this type grows in my backyard and it stands 59.6 feet tall. Find the probability that the height of a randomly selected tree is as tall as mine or shorter. My neighbor also has a tree of this type growing in her backyard, but hers stands 74.6 feet tall. Find the probability that the full height of a randomly selected tree is at least as tall as hers. Enter your answers as decimals accurate to 3 decimal places.
The weight of checked bags for a major airline can be modeled by a normal curve with mean 35.6 pounds and standard deviation 4.8 pounds. Use the 68-95-99.7 rule to approximate the probability that a randomly selected checked bag weighs more than 45.2 pounds. a.0.68 b.0.025 c.0.95 d.0.16
If z is a standard normal variable, find the probability that z is between -2.07 and 3.28
A population of heights is normally distributed with a mean of 68.8 inches and a standard deviation of 4.6 inches. Suppose a person is randomly selected from this population. What is the probability that the person's height is greater than 71 inches? A. 0.16 B. 0.32 C. 0.68 D. 0.84
A personal computer is used for office work at home, research, communication, personal finances, education, entertainment, social networking, and a myriad of other things. Suppose that the average number of hours a household personal computer is used for entertainment is two hours per day. Assume the times for entertainment are normally distributed and the standard deviation for the times is half an hour. a. Find the probability that a household personal computer is used for entertainment between 1.8 and 2.75 hours per day.
A shipwrecked individual is marooned on a desert island with a supply of food, water, and a quarter. Bored, the individual flips the quarter 10,000 times. The least number of times that "heads" is expected to be the outcome is: (Whole number). Hint: Calculate the standard deviation and use that to determine the low end of the expected probability.
Assume that the traffic to the web site of Smiley’s People, Inc., which sells customized T-shirts, follows a normal distribution, with a mean of 4.6 million visitors per day and a standard deviation of 880,000 visitors per day. What is the probability that the web site has between 3 million and 4 million visitors in a single day? If needed, round your answer to four decimal digits.
Records of a health insurance company show that 30% of its policyholders over 50 submit a claim during the year. 15 policyholders over 50 are selected at random; what is the probability that at least 10 will submit a claim during the year? What is the probability that 4 will submit a claim during the year? How many do you expect to submit a claim. What is the standard deviation?
Assume that the time it takes the housekeeping crew of a local hotel to clean a room varies uniformly between 25 and 50 minutes. Calculate the mean and variance for the distribution. Select one: O a. 37.5 and 50.08 O b. 15.5 and 50.08 O c. 51.2 and 36.6 O d. 37.5 and 78.5
The length of the long-distance calls made by the employees of a certain company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.5 minutes. Find the probability that a call will last between 5 and 10 minutes. A. .3897 B. .1788. C. .6290. D. .6308

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