6.58 A random sample of 10 stock market mutual funds was taken. Suppose that rates of returns on the popu- lation of all stock market mutual funds follow a nor- mal distribution. a. The probability is 0.10 that sample variance is greater than what percentage of the population variance? b. Find any pair of numbers, a and b, to complete the following sentence: The probability is 0.95 that the sample variance is between 1% and b of the population variance. c. Suppose that a sample of 20 mutual funds had been taken. Without doing the calculations, indicate how this would change your answer to part (b)