help solve both and explain.

7. Tell whether the following distribution is a valid discrete probability distribution then find the mean (Expected value) and the standard deviation. (10 pts) x P(x) -$1.50 0.3 $0.00 0.5 $2.75 0.1 $5.00 0.1 8. Refer to the table (Titanic ship) (10 pts) Survived Died Men 332 1360 Women 318 104 Boys 29 35 Girls 27 18 If we randomly select someone who died, what is the probability of getting a man