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Are high school GPA's inflating over time? A random sample of 150 student GPA's from this year had a mean 3.21 and a standard deviation

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Are high school GPA's inflating over time? A random sample of 150 student GPA's from this year had a mean 3.21 and a standard deviation of .53. A random sample of 150 student GPA's from 10 years had a mean 3.08 and a standard deviation of .64. What sample size would be required to detect a difference of 0.10 in the mean GPA's at the a = .05 level

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