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 population​ mean? Assume that a 95​% confidence level is desired. If using the range rule of​ thumb, sigma can be estimated as StartFraction range Over 4 EndFraction
equalsStartFraction 6 minus 0 Over 4 EndFraction
equals1.5. Does the sample size seem​ practical?
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Part 1
The required sample size is
  
enter your response here.
​(Round up to the nearest whole number as​ needed.)