Question: 6.71 It has been found the retirement age of a community follows a normal distribution with a mean of 75 years and a standard deviation

6.71 It has been found the retirement age of a community follows a normal distribution with a mean of 75 years and a standard deviation of 3 years. A random sample of 11 people from the community is taken.

a. What is the probability that the sample mean retirement age taken is more than 77 years?

b. The probability is 0.18 that the sample mean retirement age taken is less than how many?

c. The probability is 0.05 that the sample standard deviation of retirement age taken is less than how many?

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Question: 6.71 It has been found the retirement age of a community follows a normal distribution with a mean of 75 years and a standard deviation

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