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A bank installed an ATM. After several months of operation, a sample of 100 customers showed the following use of the ATM in a month.
Number of Times ATM Used / Frequency
0 / 25
1 / 30
2 /20
3 /10
4 /10
5 /5
a. What is the estimate of proportion of customers who do not use the ATM in a month?
b. Develop 95 percent confidence interval for this estimate. Can the bank be sure that at least 40% of customers will use the ATM?
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