what is the real interest rate for a savings account that has a nominal interest rate of 1%

Can someone answer this question? : )

What are the domain and range of the function f(x)=2^x+1

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?