Answer :
At least 75% of his total credits were certain to have a grade point average between 2.00 and 4.0.
By looking at the standard deviation of 0.25, we can calculate the range of the grade point averages which are within two standard deviations away from the mean. In this case, the mean is 3.00, so two standard deviations away would be 2.00 (3.00 - 0.25 x 2) and 4.00 (3.00 + 0.25 x 2). Since the grade point averages within this range are certain to have a grade point average between 2.00 and 4.0, at least 75% of the total credits are certain to have a grade point average between these two numbers.
Lower limit (2 standard deviations away from the mean):
3.00 - (0.25 x 2) = 2.00
Upper limit (2 standard deviations away from the mean):
3.00 + (0.25 x 2) = 4.00
Therefore, at least 75% of the total credits have a grade point average between 2.00 and 4.00.
Learn more about average here
https://brainly.com/question/24057012
#SPJ4
