Which is the equation of a parabola with vertex (0,0) and directrix y= 4 a. Y^2 = -8x
b. Y^2 = -16x
c. X^2 = -8y
d X^2 = -16y

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

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step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right