Use the following steps to complete this task in explanation:
Explanation/Reference:
Explanation:
Step 1: Click cell L2, and the click the Insert Function Button.

Step 2: In the Insert Function dialog box select Category Statistical, select function AVERAGEIF, and click OK.

Step 3: In the function Arguments dialog box click the reference button.

Step 4: Click cell F7, shift-click cell F29, and press the enter key.

Step 5: In the Function Arguments dialog box in the Criteria box type: 0, in the Average_range box type:
Homework, and click the OK button.