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According to Pew Research Center 2011 study, a typical American teen owning a cell phone spends...

According to Pew Research Center 2011 study, a typical American teen owning a cell phone spends an average of 96 minutes a day text messaging.

Assume normal distribution with a standard deviation of 33 minutes.

a. What percent of teens send less than 75 minutes per day on text messaging?

b. Find and interpret P75, the 75th percentile

Problem #4

According to a recent study, the mean amount of sleep college students aged 17-24 get on a typical night is 6.8 hours with a standard deviation of 0.6 hours. Assume normal distribution.

a. What is the probability that a randomly selected college student gets more than 7 hours

of sleep on a typical night?

b. What is the probability that in a random sample of 16 students, the mean amount of

sleep on a typical night is above 7 hours?

math   Statistics-And-Probability   
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