i need the formula with the amswers please

Suppose the returns on long-term corporate bonds and T-bills are normally distributed. Based on the values below answer the following questions a. What is the probability that in any given year, the return on long-term corporate bonds will be greater than 10 percent? Less than 0 percent? b. What is the probability that in any given year, the return on T-bills will be greater than 10 percent? Less than 0 percent? c. In 1979, the return on long-term corporate bonds was -2.76 percent. How likely is it that such a low return will recur at some point in the future? T-bills had a return of 10.56 percent in this same year. How likely is it that such a high return on T-bills will recur at some point in the future? 6.30% 8,40% Long-term corporate bonds Average return Standard deviation T-bills Average return Standard deviation a. Return greater than Return less than b. Return greater than Return less than C. Return less than 3.50% 3.10% 10.00% 0.00% 10.00% 0.00% -2.76% Standard deviation a. Return greater than Return less than Return greater than Return less than Return less than Return greater than 3.10% 10.00% 0.00% 10.00% 0.00% -2.76% 10 56% Complete the following analysis. Do not hard code values in your calculations. You must use the built-in Excel functions to answer this question. a. Probability of return greater than 10% Probability of return less than 0% b. Probability of return greater than 10% Probability of return less than 0% c. Probability of return less than -2.76% Probability of return greater than 10.56%