Assume that all gradeepoint averages are to be standardized on a scale between 0 and 5. Howr many graderpoint averages must be obtained so that the sample mean is within 0.008 of the population mean? Assume that a 95% condence level is desired. If using the range rule of thumb, a can be estimated as range 5 0 4 T 21.25. Does the sample size seem practical? The required sample size is _ (Round up to the nearest whole number as needed.)