Suppose that the population of surfers in the United States have ages that are normally distributed with a mean of 34 years and a standard deviation of 4 years.
My niece is 30 years old and a surfer. What percentage of surfers are younger than my niece? (Round to the nearest hundredths of a percent)
P(x<30)=__________%
Suppose that the population of surfers in the United States have ages that are normally distributed with a mean of 34 years and a standard deviation of 4 years.
If a random sample of 100 surfers is taken, what is the probability that the sample’s average age is between 33 and 35 years old? (Round to the nearest hundredths of a percent)
P(33<x<35)=________%