Suppose the mean​ per-person check for brunch at a restaurant chain is approximately ​$13.75. Complete parts​ (a) through​ (d) below.         b. Assuming a standard deviation of ​$6.50​, what sample size is needed to​ estimate, with 90​% ​confidence, the mean​ per-person check for brunch to within ±​$0.25​?   The sample size needed is ___

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Suppose the mean​ per-person check for brunch at a restaurant chain is approximately
​$13.75.
Complete parts​ (a) through​ (d) below.
 
 
 
 
b. Assuming a standard deviation of ​$6.50​, what sample size is needed to​ estimate, with 90​% ​confidence, the mean​ per-person check for brunch to within ±​$0.25​?
 
The sample size needed is
___
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