Monthly rates of return on the shares of a particular common stock are independent of one another

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Monthly rates of return on the shares of a particular common stock are independent of one another and normally distributed with a standard deviation of 2.2.
A sample of 12 months is taken.
a. Find the probability that the sample standard deviation is less than 2.7.
b. Find the probability that the sample standard deviation is more than 1.3.

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