3, A report indicates that 40% of the memory chips produced by a certain manufac

Question

3, A report indicates that 40% of the memory chips produced by a certain manufacturer are defective. A computer store has received a shipment of 20 memory chips from this manufacturer. a. What is the probability that at least 5 of the chips in this shipment are defective? b. What is the probability that majority of the chips in this shipment are no-defective? c. What is the probability that the number of non-defective chips in this shipment is at least twice as many as the number of defective chips?

Explanation / Answer

Ans:

Binomial distribution with n=20,p-0.4

Use Excel function BINOMDIST

a)P(x>=5)=1-BINOMDIST(4,20,0.4,true)=1-0.0510=0.949

b)P(x>10)=1-P(x<=10)=1-BINOMDIST(10,20,0.6,TRUE)=1-0.2447=0.7553

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