Please provide answers and explanations in Excel spreadsheet.
1. According to Investment Digest (“Diversification and the Risk/Reward Relationship”, Winter 1994, 1-3), the meanof the annual return for common stocks from 1926 to 1992 was 15.4%, and the standard deviationof the annual return was 24.5%. During the same 67-year time span, the mean of the annual return for long-term government bonds was 5.5%, and the standard deviation was 6.0%. The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variableswith the means and standard deviations given previously.
a. Find the probabilitythat the return for common stocks will be greater than 8%.
b. Find the probability that the return for common stocks will be greater than 20%.
The probability that return for common stocks are determined with different percentages.