SOLUTION: The probability of a light bulb being defective is 0.02. If Home Depot buys 100 bulbs, find the probability that they get at least one that is defective.

Question 968975: The probability of a light bulb being defective is 0.02. If Home Depot buys 100 bulbs, find the probability that they get at
least one that is defective.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
this uses binomial probability
p = .02, q = .98, n = 100
**********************************************
binomial probability formula is
Probability ( X = k ) = (combination of n things taken k at a time) * p^k * q^(n-k)
**********************************************
Probability ( X > or = 1 ) = 1 - P( X = 0 )
P( X = 0 ) = combination of 100 light bulbs taken 0 at a time) * (.02)^0 * (.98)^100 = (( 100! / (0! * (100 - 0)!)) * 1 * 0.132619556
P( X = 0 ) = 1 * 0.132619556 approx 0.13
Probability ( X > or = 1 ) = 1 - 0.13 = 0.87
therefore,
probability that they get at least one that is defective is 0.87
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