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(Solution document) Unknown to the quality-control inspector, 20% of a very large shipment of electric switches are defective.


Unknown to the quality-control inspector, 20% of a very large shipment of electric switches are defective. Fifteen switches from the shipment will be randomly selected and inspected prior to accepting the shipment. Let X- the number of defective switches in a sample of fifteen. Use the appropriate output in the appendix to answer the following question. Write down all the numbers in the table that you use to calculate your answers.


1) The inspector has been told to reject the shipment if, in a sample of 15 switches, 2 or more are defective. What is the probability that the shipment will be rejected?

2) What is the probability that between 5 and 7 switches are defective?

3) What is the probability that all of the switches are good?

4) Suppose the inspector decides to take a larger sample of 100 switches. What is the chance the sample proportion of defective is less than 0.10?


Please answer the questions and explain it. Otherwise I can't understand it. Thank you so much.

 

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