Answer:
5.6
Step-by-step explanation:
fr fr
6.2
The expected value is the sum of the each value times its probability.
X = (3×0.2) + (4×0.1) + (5×0.25) + (7×0.05) + (9×0.4)
X = 0.6 + 0.4 + 1.25 + 0.35 + 3.6
X = 6.2
