Question

20% of the bolts by a machine are defective. Determine the probability that out of 7...

20% of the bolts by a machine are defective. Determine the probability that out of 7 bolts chosen at random that ...

a. ... one is defective?

b. ... two or more are defective?

Math   Statistics-And-Probability   
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Answer #1

The number of defective bolts out of the 7 selected here could be modelled as:

a) Probability that one of the bolt is defective is computed here as:

Therefore 0.3670016 is the required probability here.

b) Probability that two or more are defective is computed here as:

Therefore 0.4232832 is the required probability here.

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