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Category > Statistics Posted 14 Jun 2017 My Price 4.00

According to a recent survey, high school girls average 100 text messages daily

According to a recent survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken.

 

a. What is the probability that the sample mean is more than 105?

b. What is the probability that the sample mean is less than 95?

c. What is the probability that the sample mean is between 95 and 105?

Answers

Alpha Geek
(8)
Status NEW Posted 14 Jun 2017 09:06 AM My Price 4.00

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file 1497432274-2233056_1_636329296374545889_Normal-sample-Probability-.xlsx preview (179 words )
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