Suppose the returns on an asset are normally distributed. The historical average annual return for the asset was 7.6 percent and the standard deviation was 8.6 percent.

a. What is the probability that your return on this asset will be less than 9.3 percent in a given year?

I got (-9.3%-7.6%)/8.6%=-1.97, z-table -1.97 says 0.244=2.44% but it was wrong

b. What range of returns would you expect to see 95 percent of the time?

c. What range would you expect to see 99 percent of the time?