The owner of a newspaper stand receives 50 copies of Al Ahram newspaper every morning. The number of copies sold, x, varies randomly according to the following probability distribution:

p1x2 = c 1

45, x = 35, 36,c, 49 1

30, x = 50, 51,c, 59 1

33, x = 60, 61,c, 70

(a) Determine the probability that the owner will sell out completely.

(b) Determine the expected number of unsold copies per day.

(c) A single copy costs 50 cents and sells for $1.00. Unsold copies have no value.

Determine the expected net income per day.