Use the Following Information for Questions

Use the following information for questions:
Grade school students, especially the ones in higher grades, tend to spend a lot of time on the computer already. The average amount of time 4^th grade boys spend on the computer is 5 hours per week, with a standard deviation of 1 hour. For 5^th grade boys the average increases to 7 hours per week with a standard deviation of 1.5 hours. Random sample of 20 4^th grade students and 25 5^th grade students are to be selected.
-What is the expected value for the difference in sample means (5^th − 4^th grade)?

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