SOLUTION: The following table lists the probability distribution of the number of refrigerators owned by all families in a city. Study the distribution and answer the questions. x 0 1

Question 452695: The following table lists the probability distribution of the number of refrigerators owned by all families in a city. Study the distribution and answer the questions.
x 0 1 2 3
P(x) .02 .28 .61 .09
The probability that a family owns:
a. Exactly 3 refrigerators is: _______
b. At least 2 refrigerator is: _____
c. Fewer than 3 refrigerators is: _____
d. The mean of the distribution is  = ______
e. The standard deviation of the distribution is  = _____

Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
a. 0.09
b. 0.61 + 0.09 = 0.70
c. 1 - 0.09 = 0.91
d. = E(X) = 0*0.02 + 1*0.28 + 2*0.61 + 3*0.09 = 1.77
e. variance =
==> standard deviation =
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