2. 外语
  3. At a fund-raising event, 43 participants donated $60 each, 21 participants donated $80 each, and 16 participants donated $100 ea

At a fund-raising event, 43 participants donated $60 each, 21 participants donated $80 each, and 16 participants donated $100 ea

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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 thebutton 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 thebutton adds the number in the current display to the number stored in memory and replaces the number stored in memory by the sum. When thebutton is pressed in the computation above, the current value in memory, 5,860, is displayed. To clear the memory, use thebutton, and the M next to the display disappears.
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