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?
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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