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Estimate the true proportion of home

A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?

a. 142

b. 283

c. 566

d. 1132

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## Q : Probability of there being three customers in system

A time study is made of a tool crib and it is found that the probability of it taking more than T minutes to fill an order is given by the expression e-0.2T. Customers are found to arrive at the tool crib at a Poisson rate of 10/hour. There is a s