Question: Exercise 11.120 describes a random variable that counts the number of senior citizens in a sample. Use the information in that exercise to find the

Exercise 11.120 describes a random variable that counts the number of senior citizens in a sample. Use the information in that exercise to find the mean and standard deviation of this random variable.

Exercise 11.120

In the 2010 US Census, we learn that 13% of all people in the US are 65 years old or older. If we take a random sample of 10 people, what is the probability that 3 of them are 65 or older? That 4 of them are 65 or older?

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