How many green books it has

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Reference no: EM13168330

1. Webster Library wants to know how many green books it has. Out of the 500 shelves of books, 3 shelves were selected. These shelves hold 150 books each. 54 of the books sampled were green.

a. What percentage of the books is green?

b. What is the 90% confidence interval for the percentage of green books

c. How many books need to be sampled to be within 4% with 95% confidence?

2. 35 books were sampled at the bookstore. They had an average price of $160 with a standard deviation of $43.

a. What is the 95% confidence interval for the average price of a book?

b. How may books need to be checked to be 90% confident that the average price was within $10?

Reference no: EM13168330

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