Question 1119963
To compute a p-value, one needs to know what the value of the sample should be compared to, some hypothesized or presumed value.  It is possible to compute the standard error from the above but not the difference in GPAs, since only one is given.
Ho:GPA is 3.40
Ha: GPA is not 3.40
alpha=0.10
test stat t=0.95, 2 way, df=44
Critical value |t|>1.68
t=mean diff/s/sqrt (n)=-0.04/(0.02/sqrt(45))=-13.42
highly significant p-value <0.0001
(Could it be possible that the standard deviation of the sample was 0.2?)