Example 2.1 Writing an Excel Formula

For the student exam scores given in Example 2.4, suppose that each of the first two exams contributes 30 percent to the student’s overall score and the final exam contributes 40 percent. (a)Construct a worksheet similar to that shown in Fig 2.23 for this situation. Be sure to include the new weighting factors within the formulas, as required. (b)In column G, calculate the difference between each student’s overall score and the class average (i.e., the average of the overall scores, shown in cell E10). (c)In cell G10, calculate the average of the differences in cells G2 through G8. What value do you expect to see here, and why?

Example 2.5 Evaluating Trigonometric Functions Suppose we wish to evaluate the following algebraic formulas, taken from Example 1.1, Using an Excel worksheet: v x = initial horizontal velocity, determined as v x =v 0 cos(θ), ft/sec v y = initial horizontal velocity, determined as v y =v 0 cos(θ), ft/sec v 0 = initial velocity acting at angle θ, ft/sec. (Note that θ is expressed in radians, not degrees.)

An Excel worksheet contains the formulas shown in Fig. 2.27(a). These formulas produce the numerical results shown in Fig. 2.27(b). Whenever you press F9 the calculated values change. What is the purpose of this worksheet? OneTwoSum =RAND() =INT(6*A6)+1=INT(6*B6)+1=A7+B7 OneTwoSum

Reconstruct the worksheet in Example 2.4 and show the Print Preview in the following ways: (a)In the normal manner, without gridlines, and without row/column headings. (b)Including gridlines and row/column headings. (c)Displaying only cell B1 through E8.