Luis is a salesperson specializing in televisions at an electronics store. This table shows the probability of his selling various sizes of televisions.

TV Sales Probability

30" 0.1

25" 0.4

19" 0.3

13" (smallest) 0.15

1. What is the probability of his selling a larger television than the ones listed?

2. Luis's manager offers him a selling incentive. He agrees to give Luis $25 for every 30" television. If Luis sells a larger television, the manager agrees to give him $50. What is the mathematical expectation for this payment plan?

I don't understand how i'm suppose to go about solving this problem. I would really appreciate your help. REALLY REALLY