Hi I'm having a hard time understanding this problem. I'm familiar with hypothesis testing, but it looks like here I need to compare two different data's? I don't know how to do this, and was wondering if I could get some additional help. Thank you so much!

1) The National Center for Health Statistics reports that the systolic blood pressure for males 35 to 44 years of age has a mean 128 and a standard deviation 15. The medical director of a large company looks at the medical records of 72 executives in this age group and finds that the mean systolic blood pressure in this sample is x = 125.7 Is this evidence that the company's executives have a different mean blood pressure from the general population? Suppose that we know that blood pressures follow a Normal distribution with standard deviation o = 15. Use a significance level of a = 0.05