Moderate# Mean and Standard Deviation Difference for Two Random Variables.

APSTAT-LZLLJD

Random variable **A** is normally distributed with a mean of 20 and a standard deviation of 5. Random variable **B** is normally distributed with a mean of 35 and a standard deviation of 12. If **A** and **B** are independent variables which of the following describes the distribution of **A** $-$ **B**?