Keith’s Florists has 15 delivery trucks, used mainly to deliver flowers and flow
ID: 3130006 • Letter: K
Question
Keith’s Florists has 15 delivery trucks, used mainly to deliver flowers and flower arrangements in the Greenville, South Carolina, area. Of these 15 trucks, 8 have brake problems. A sample of 6 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes? (Round your answer to 4 decimal places.)
Keith’s Florists has 15 delivery trucks, used mainly to deliver flowers and flower arrangements in the Greenville, South Carolina, area. Of these 15 trucks, 8 have brake problems. A sample of 6 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes? (Round your answer to 4 decimal places.)
Explanation / Answer
Ans: Probability of selecting 2 defective out of 6 defective:
prob p of finding a defective item = 8/15
prob q = 7/15
Prob (x=2) = 6C2 (8/15)^2 (7/15)^4 = 15 * 0.284 * 0.047 = 0.2002