Difference between revisions of "1990 AJHSME Problems/Problem 9"
5849206328x (talk | contribs) (Created page with '==Problem== The grading scale shown is used at Jones Junior High. The fifteen scores in Mr. Freeman's class were: <cmath>\begin{tabular}[t]{lllllllll} 89, & 72, & 54, & 97, & 7…') |
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{{AJHSME box|year=1990|num-b=8|num-a=10}} | {{AJHSME box|year=1990|num-b=8|num-a=10}} | ||
[[Category:Introductory Algebra Problems]] | [[Category:Introductory Algebra Problems]] | ||
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Latest revision as of 23:05, 4 July 2013
Problem
The grading scale shown is used at Jones Junior High. The fifteen scores in Mr. Freeman's class were: ![\[\begin{tabular}[t]{lllllllll} 89, & 72, & 54, & 97, & 77, & 92, & 85, & 74, & 75, \\ 63, & 84, & 78, & 71, & 80, & 90. & & & \\ \end{tabular}\]](http://latex.artofproblemsolving.com/d/8/9/d89893f848ae5850ac8c198d06278269b17d3489.png)
In Mr. Freeman's class, what percent of the students received a grade of C?
![\[\boxed{\begin{tabular}[t]{cc} A: & 93 - 100 \\ B: & 85 - 92 \\ C: & 75 - 84 \\ D: & 70 - 74 \\ F: & 0 - 69 \end{tabular}}\]](http://latex.artofproblemsolving.com/6/7/f/67f2dc5e3c44e79d79243fe5e8b62b3ca804f22f.png)
Solution
We just count to find that there are 
students in the 
range.
There are 
total, so the percentage is 
.
See Also
| 1990 AJHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 8 |
Followed by Problem 10 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
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