id 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 0.014 of the population mean? Assume that a 99% confidence level is desired. If using the range rule of thumb, o can be estimated as range 6-0 4 = 1 5. Does the sample size seem practical? hnen Tome w the r The required sample size is (Round up to the nearest whole number as needed.)