"An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to812 hours and a standard deviation of 57 hours. Find the probability that a random samples of 36 bulbs will have an average life ofless than 822 hours."A0.62550.85310.37450.1469

Answered: Image /qna-images/answer/f24ce2f2-e425-4906-8573-85f10143c55f.jpg

Answered: "An electrical firm manufactures light…

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 weight of goods shipped in containers of a certain size is a normally distributed random variable. It is known that 65% of the containers have a net weight above 4,98 tons, and 45% of containers net weight above 5,2 tons. Find the mean and standard deviation of the net weight containers.
A random sample of size 29 is selected from a normal population with mean = and variance = 8. Determine the probability that s? (the sample variance) is between 11.81 and 14.57. 12
The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic speed using premium fuel is a normally distributed random variable with a mean of u= 26.75mpg and a standard deviation of o=3.50 mpg. a. What is the standard error of X, the mean from a random sample of 36 full ups by one driver?(Round your answer to 4 decimal places. ) Standard error of X= b. Within what interval would you expect the sample mean to fall, with 99 percent probability? (Round your answers to 4 decimal places.). the interval is from _____to ____
MCAT scores are normally distributed with a mean of ? = 501.5 and a standard deviation of ? = 10.7. Find the probability that a person will score 510 or more.
"An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 809 hours and a standard deviation of 89 hours. Find the probability that a random samples of 36 bulbs will have an average life between 790 and 814 hours." A 0.3669 0.6331 0.1003 0.5328
The acidity of human blood, measured on a pH scale, is a normal random variable with a mean of 7.4 and standard deviation of 0.17. Find the probability that the acidity of a person's blood has a pH greater than 7.5.
Random samples of size 46 are drawn from a population with mean 161.9 and standard deviation 16.1. Find the mean and the standard deviation of the sample mean. Round to four decimal places.Mean = Standard Deviation = Enter your answer as a number accurate to 4 decimal places.
The life of light bulbs is distributed normally. The standard deviation of the lifetime is 26 hours and the mean lifetime of a bulb is 570. Find the probability of a bulb lasting for at least 603 hours (Round your answer to four decimal places) CS Scanned with CamScanner
The life of light bulbs is distributed normally. The standard deviation of the lifetime is 28 hours and the mean lifetime of a bulb is 580. Find the probability of a bulb lasting for at most 605 hours (Round your answer to four decimal places) CS Scanned with CamScanner 1
The test score of a physics class with 160 students is distributed normally with a mean of 75 and standard deviation of 7. what percentage of the class has a test score between 68 and 82 Approximately how many students have a test score between 61 and 89? What is the probability that a student chosen at random has a test score between 54 and 75? Approximately how many students have a test score greater than or equal 96?
You studied a third CPU and found that its speed is a continuous random variable that follows a normal distribution, with a mean value of 3.6 GHz and a standard deviation of 0.8 GHz. Find the probability that the third CPU would run faster than the expected speed of CPU1.
Randomly sample 256 items from a population where individuals have a normal distribution with a mean of 250 and a standard deviation of 80, find the following probability rounded to 4 decimal places. 230 235 240 z = -4 z = -2 P(Z < 252.4) 245 250 z = 0 255 260 265 z = 2 270 Z =

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