Question

Mean is 90 minutes. Standard deviation is15 minutes. 68% is between which two time intervals? 99.7%...

Mean is 90 minutes.

Standard deviation is15 minutes.

68% is between which two time intervals?

99.7% of the people work out for no more than ____________ minutes.

Homework Answers

Answer #1

Given

= 90, = 15

According to Emperical rule(68-95-99.7) rule,

Approximately, 68% of the data falls in 1 standard deviation of the mean.

That is 68% is between interval ( - , + ) =( 90-15, 90+15) = ( 75,105)

That is 68% is between time interval (75,105)

Approximately, 99.7% data falls in 3 standard deviation of the mean.

We have to find upper bound of the interval such that 99.7% pf the people work out for no more that value.

3 standard deviation above the mean = + 3 = 90 + 3 * 15 = 135

99.7% of the people work out for no more than 135 minutes.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
a. Draw a normal curve on which the mean (90 minutes) and the standard deviation (7...
a. Draw a normal curve on which the mean (90 minutes) and the standard deviation (7 minutes) are correctly located. b. What percent of students used more than 90 minutes but less than 100 minutes to complete the exam? Show your work. c. 10% of students used more than how many minutes to complete the exam? Show your work
Use the 68-95-99.7 rule to solve the problem. The time it take Claudia to drive to...
Use the 68-95-99.7 rule to solve the problem. The time it take Claudia to drive to work is normally distributed with a mean of 48 minutes and a standard deviation of 5 minutes. What percentage of the time will it take her less than 53 minutes to drive to work? ________% Answer as a whole number.
Suppose a geyser has a mean time between eruptions of 79 minutes. Let the interval of...
Suppose a geyser has a mean time between eruptions of 79 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 22 minutes. Complete parts ​(a) through ​(e) below. ​(a) What is the probability that a randomly selected time interval between eruptions is longer than 90 ​minutes? The probability that a randomly selected time interval is longer than 90 minutes is approximately nothing. ​(Round to four decimal places as​ needed.) ​(b) What is the probability...
Suppose a geyser has a mean time between eruptions of 85 minutes. Let the interval of...
Suppose a geyser has a mean time between eruptions of 85 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 23 minutes. What is the probability that a random sample of 9 time intervals between eruptions has a mean longer than 96 ​minutes? The probability that the mean of a random sample of 9 time intervals is more than 96 minutes is approximately _______. ​(Round to four decimal places as​ needed.)
Suppose a geyser has a mean time between eruptions of 84 minutes. If the interval of...
Suppose a geyser has a mean time between eruptions of 84 minutes. If the interval of time between the eruptions is normally distributed with standard deviation 27 minutes A. Whats the probability that a random sample of 13 time intervals between eruptions has a mean longer than 95 minutes. B. Whats the probability that a random sample of 28 time intervals between eruptions has a mean time longer than 95 minutes. C. What effect does increasing the sample size have...
Fix-it Copiers advertises a mean time of 100 minutes for office calls with a standard deviation...
Fix-it Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed: A.) between 100 and 120 minutes? B.) in less than 120 minutes? C.) in less than 60 minutes? D.) between 120 and 150 minutes? E.) between 60 and 120 minutes? F.) Twenty percent of their jobs take more than how much time?
Suppose a geyser has a mean time between eruptions of 86 minutes. Let the interval of...
Suppose a geyser has a mean time between eruptions of 86 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 19 minutes. Complete parts ​(a) through ​(e) below. (a) What is the probability that a randomly selected time interval between eruptions is longer than 94 minutes? (b) What is the probability that a random sample of 9 time intervals between eruptions has a mean longer than 94 ​minutes? (c) What is the probability that...
Suppose a geyser has a mean time between eruptions of 86 minutes Let the interval of...
Suppose a geyser has a mean time between eruptions of 86 minutes Let the interval of time between the eruptions be normally distributed with standard deviation 26 minutes . ​(a) What is the probability that a randomly selected time interval between eruptions is longer than 99 ​minutes? ​(b) What is the probability that a random sample of 9 time intervals between eruptions has a mean longer than 99 ​minutes?
3.   The mean delivery time is 36 minutes and the population standard deviation is six minutes....
3.   The mean delivery time is 36 minutes and the population standard deviation is six minutes. Assume the sample size is 81 restaurants with the same sample mean. Find a 90% confidence interval estimate for the population mean delivery time. 6.If in a sample of size n=49 selected normal population, the sample mean X=48 and population standard deviation is 21, what is your statistical decision, if your H0 :µ = 45, α=0.05
Suppose a geyser has a mean time between eruptions of 75 minutes. Let the interval of...
Suppose a geyser has a mean time between eruptions of 75 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 26 minutes. Complete parts ​(a) through ​(e) below ​ (a) What is the probability that a randomly selected time interval between eruptions is longer than 87 ​minutes? ​(b) What is the probability that a random sample of 13 time intervals between eruptions has a mean longer than 87 ​minutes? ​(c) What is the probability...