A stock market index drops by 1.38 points. What rational number represents the change in the index? *

i think it's b

step-by-step explanation:

because the graph is 2 above (0,0)

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