*High School problem not Middle School
You roll a die, winning nothing if the number of spots is even, $7 for a 1 or a 3, and $16 for a 5.
a. Find the expected value and standard deviation of your prospective winnings
b. You play twice. Find the mean and standard deviation of your total winnings
c. You play 30 times. What is the probability that you win at least $170?