1) FORTUNE FINANCING wants to estimate the average account balances of its customers to within $50 with 99% confidence. The population standard deviation is $250. How many accounts should be included in the sample?

2) How many students should be sampled to determine the percentage of female students to within a 3% error at a 95% level of confidence?

3) can you help e answer this question

A farmer has 456 feet of fencing. Determine the greatest rectangular area that he can enclose with this fencing.

pur-new-sol

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