7.7 Assume that all​ grade-point averages are to be standardized on a scale between 0 and 6. How many​ grade-point averages must be obtained so that the sample mean is within 0.012 of the...

7.7

Assume that all​ grade-point averages are to be standardized on a scale between 0 and

How many​ grade-point averages must be obtained so that the sample mean is within

of the population​ mean? Assume that a

confidence level is desired. If using the range rule of​ thumb,

can be estimated as

Does the sample size seem​ practical?