Answer: Reject H0. We do not have convincing evidence that the mean salary offer for accounting graduates of this university is higher than the national average of $48,743
Step-by-step explanation:
The relevant t-test for this situation would be:

Which is (49870-48743) ÷ standard error
standard error = standard deviation ÷√sample size
From the t-test, we obtain the value = 2.41...
Using α = 0.05, our critical value is 1.96. As 2.41 is larger than 1.96, we reject our null hypothesis that the mean salary offer is higher than $48,743