Marlene works two jobs to help make ends meet.
As a waitress, her weekly earnings (including tips) are approximately normally distributed with a mean of $\$590$ and a standard deviation of $\$45$.
As a dog walker, her weekly earnings depend upon how many dog walks she provides that week. The number of dog walks she provides each week is a random variable (D) whose probability distribution is shown below.
If Marlene charges $\$20$ per dog walk, on average, how much can she expect to make each week from both of her two jobs combined?