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Suppose that the population of surfers in the United States have ages that are normally distributed...

Suppose that the population of surfers in the United States have ages that are normally distributed with a mean of 28 years and a standard deviation of 5 years.

- What percentage of surfers are less than 32 years old?

- If a random sample of 60 surfers is taken, what is the probability that the sample’s average age is between 28 and 29 years old?

Math   Statistics-And-Probability   
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