Which function is a quadratic function? f(x) = 2x2 g(x) = 5x3 k(x) = –x b(x) = –9x4

The equation of a quadratic function:

a = 2

b = 0

c = 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