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# Fifteen microprocessors are randomly selected from a lot of 750 microprocessors among which 30 are defective. Find the probability of obtaining at...

Fifteen microprocessors are randomly selected from a lot of 750 microprocessors among which 30 are defective.

A. Find the probability of obtaining at most 6 defective microprocessors.

B. Find the probability of obtaining at least 8 defective microprocessors.

c. Find the probability of obtaining exactly 7 defective microprocessors.

The prob of being defective = p = 30/750 = 0.04
The no. of defectives is a Binomial(15,p) variable. Call it X.
Then, for r = 0,1,2,……..15, we have
P[X= r] = 15Cr(p)r(1-p)15-...

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