How large a sample must we take if we want the margin of error to be at most 0.01 pound with 95% confidence

The sample size  is    

Step-by-step explanation:

From the question we are told that

    The margin of error is  E  =  0.01

From the question we are told the confidence level is  95% , hence the level of significance is    

=>  

Generally from the normal distribution table the critical value  of   is  

Let take the standard deviation to be

Gnerally the sample size is mathematically represented as

=>    

=>