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# Tip #15 to Get a Top ACT Math Score (page 2)

By Brian Leaf
McGraw-Hill Professional

### Medium

1. Which of the following is closest to the mean number of rebounds Willy grabbed per game?
1. 13
2. 14
3. 15
4. 16
5. 17
2. New Leaf Learning Center held its annual yogathon for 3 days. The total money raised in the 3 days was \$24,500. The money raised, in dollars, is shown for each of the 3 days in the bar graph below.

3. Approximately what percent of the money raised by the yogathon over the 3 days did New Leaf Learning Center raise on day 2 ?
1. 12%
2. 25%
3. 33%
1. 50%
2. 65%

1. C Stem and leaf plots don't come up that often, but when they do, most kids are like "What the …!" That's why I included one here. If you know how to read them, they're easy. They are just a way of listing numbers. Even if you've never seen one before, the "note" tells you how to read it. The "note" tells you that the number "12" would be listed as a "1" in the first column and a "2" in the second column. So this question really is just an easy "mean" question. (Remember from Skill 4 that "mean" is just another word for "average.") So make a list of the 14 numbers, add them up, and divide by 14 to get the average.
2. H Many kids get scared off by a question like this because they can't get an exact number from the bar graph. That's okay, no one can. You are supposed to estimate; it's what they want you to do. So estimate the money raised on day 2. It looks a little higher than halfway between \$5000 and \$10,000, say \$8000. Then this amount divided by the total (\$24,500) gives the percent raised on day 2:
3. Notice that the answer choices are far enough apart that even an estimate allows us to identify the right answer.

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