a. Exactly 2 are defective:
"P(2) = C(2;4)\u00d7(1\/6)^2\u00d7(5\/6)^2 = 6\u00d7(1\/6)^2\u00d7(5\/6)^2 = 0.1157."
c. All are defective:
"P(4) = (1\/6)^4 = 0.00077."
b. None is defective:
"P(0) = (5\/6)^4 = 0.4823."
d. At least 1 is defective:
P(>=1) = 1 - P(0) = 1 - 0.4823 = 0.5177.
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