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**?