Monthly rates of return on the shares of a particular common stock are independent of one another and normally distributed with a population standard deviation of 1.8. A sample of 15 months is taken.

Part a)Find the probability that the samplevarianceis less than 6.76.

Part b)Find the probability that the samplestandard deviationis more than 1.2.

Draw and label a picture for each part to help explain your answer. Use the appendix tables in the back of your book; tell me what table you used and what value(s) you looked up.