Question

A manufacturer of halogen bulbs knows that 5% of the production of their bulbs will be...

A manufacturer of halogen bulbs knows that 5% of the production of their bulbs will be defective. Answer without decimal places.

a)What is the probability that exactly 3 bulbs in a carton will be defective? %

b)what is the probability that as least 2 bulbs in a carton of 20 will be defective? %

c) what is the probability that at most 2 bulbs in a carton of 20 bulbs will be defective? %

Math   Statistics-And-Probability   
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Answer #1

The number of defective bulbs in a carton of bulbs has Binomial distribution with .

The PMF of is .

a) In this part number of bulbs in the carton is not given.

Taking , the probability that exactly 3 bulbs in a carton will be defective is

b) The probability that as least 2 bulbs in a carton of 20 will be defective is

c) The probability that at most 2 bulbs in a carton of 20 bulbs will be defective is

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