What is 15% of 120?
what is 25% of 120?
32 is what percent of 80?
72 is what percent of 80?

18

30

40%

90%

Step-by-step explanation:

What is 15% of 120?

15% of 120 = 15% * 120 = 0.15 * 120 = 18

18

What is 25% of 120?

25% of 120 = 25% * 120 = 0.25 * 120 = 30

30

32 is what percent of 80?

32 = x% of 80

32 = x/100 * 80

32 = 0.8x

x = 32/0.8

x = 40

40%

72 is what percent of 80?

72 = x% of 80

72 = x/100 * 80

72 = 0.8x

x = 72/0.8

x = 90

90%

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0