At a fund-raising event, 43 participants donated $60 each, 21 participants donat

游客2024-01-12 13

问题 At a fund-raising event, 43 participants donated $60 each, 21 participants donated $80 each, and 16 participants donated $100 each. What was the average(arithmetic mean)donation per participant, in dollars?

选项

答案 73.25

解析 The solution to this problem is to compute the weighted mean

When the

button is first used, the number in the calculator display is stored in memory and an M appears to the left of the display to show that the memory function is in use. Each subsequent use of the

button adds the number in the current display to the number stored in memory and replaces the number stored in memory by the sum. When the

button is pressed in the computation above, the current value in memory, 5,860, is displayed. To clear the memory, use the

button, and the M next to the display disappears.

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