SOLUTION: A large lot of light bulbs contains 15% defective. If 9 light bulbs are randomly selected (a) the probability (with 4 decimals without rounding) that at least 2 are defective&#156

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Question 809248: A large lot of light bulbs contains 15% defective. If 9 light bulbs are randomly selected
(a) the probability (with 4 decimals without rounding) that at least 2 are defective؟

b)The mean number of defective light bulbs ?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
p=.15, q=.85, n=9
q^9+9q^8p=.5994 Probability that less then 2 are defective.
1-.5994=.4005 the probability (with 4 decimals without rounding) that at least 2 are defective.
.
9*.15=1.35 The mean number of defective light bulbs.
.
Ed