The test scores for a large statistics class have an unknown distribution with a mean of 70

Question:

The test scores for a large statistics class have an unknown with a mean of 70 and a standard deviation of 10.
a. Find k so that at least 50% of the scores are within k standard deviations of the mean.
b. Find k so that at most 10% of the scores are more than k standard deviations above the mean. Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...