400 draws are made at random with replacement from 5 tickets that are marked -2, -1, 0, 1, and 2 respectively. Find the expected value of:

Question

1. the number of times positive numbers appear
2. the sum of all the numbers drawn
3. the sum of the positive numbers drawn

Answer 1

the number of times positive numbers appear is 160

Answer 2

the sum of the positive numbers drawn is 240

Answer 3

Thanks you Din 123, the answer of B is 0 the 1 and 3 are correct.