If a study shows that the amount of time a student sleeps on any given nights...
If a study shows that the amount of time a student sleeps on any given nights is normally distributed with a mean of 7.2 hours and a standard deviation of 3 hours.
Find the probability of 28 randomly selected students sleeping less than 8 hours.
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If a study shows that the amount of time a student sleeps on any
given nights...
The time a student sleeps per night has a distribution with mean 5.1 hours and a...
The time a student sleeps per night has a distribution with mean 5.1 hours and a standard deviation of 0.4 hours. Find the probability that average sleeping time for a randomly selected sample of 30 students is more than 5 hours per night. (keep 4 decimal places)
Central Limit Theorem The time a student sleeps per night has a distribution with mean 6.2...
Central Limit Theorem The time a student sleeps per night has a distribution with mean 6.2 hours and a standard deviation of 0.5 hours. Find the probability that average sleeping time for a randomly selected sample of 32 students is more than 6 hours per night. (keep 4 decimal places)
A study of the amount of time it takes a mechanic to rebuild the transmission for...
A study of the amount of time it takes a mechanic to rebuild the transmission for a 2002 Cavalier shows that the mean is 4.5 hours and the standard deviation is 1.75 hours. If 64 mechanics are randomly selected, find the probability that their mean rebuild time is less than 5.25 hours. (8)
The time a student sleeps per night has a normal distribution with mean 6.2 hours and...
The time a student sleeps per night has a normal distribution with mean 6.2 hours and a standard deviation of 0.5 hours. Find the 32nd percentile of the sleeping time of students.
The amount of time students study for a final exam is normally distributed with a mean...
The amount of time students study for a final exam is normally distributed with a mean of 25 hours and a standard deviation of 4.0 hours. What is the probability that a student will study for more than 26 hours? a).2500 b).4013 c).5987 d) .6554
A study of the amount of time it takes a mechanic to rebuild the transmission for...
A study of the amount of time it takes a mechanic to rebuild the transmission for a 2010 Chevrolet Colorado shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time is less than 8.9 hours. Round to four decimal places. A.0.4276 B.0.9605 C.0.9589 D.0.9756
1. The time needed to complete a final examination in a particular college course is normally distributed with a mean o...
1. The time needed to complete a final examination in a particular college course is normally distributed with a mean of 83 minutes and a standard deviation of 13 minutes. Answer the following questions. a. What is the probability of completing the exam in one hour or less (to 4 decimals)? b. What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals)? 2. According to the...
It is known that the number of hours a student sleeps per night has a normal...
It is known that the number of hours a student sleeps per night has a normal distribution. The sleeping time in hours of a random sample of 8 students is given below. 8.6, 8.3, 7.6, 6, 7.1, 5.6, 5.1, 6. Compute a 98% confidence interval for the true mean time a student sleeps per night and fill in the blanks appropriately. We have 98 % confidence that the true mean time a student sleeps per night is between ____ and...
Question 2 0/1 pts Solve the problem. A study of the amount of time it takes...
Question 2 0/1 pts Solve the problem. A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time is less than 8.9 hours. 0.4276 0.9756 0.9608 • 0.9589
Amount of time students study for a midterm test is normally distributed with a mean of...
Amount of time students study for a midterm test is normally distributed with a mean of 25 hours and a standard deviation of 4.0 hours. What's the probability that one will study for between 24 & 26 hours?
A study of the amount of time it takes a mechanic to rebuild the transmission for a 2002 Cavalier shows that the mean is 4.5 hours and the standard deviation is 1.75 hours. If 64 mechanics are randomly selected, find the probability that their mean rebuild time is less than 5.25 hours. (8)
Question 2 0/1 pts Solve the problem. A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time is less than 8.9 hours. 0.4276 0.9756 0.9608 • 0.9589
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