SOLUTION: A) In a set of test scores, nine scores are above the 40th percentile. How many test scores are in this set. B) Nine students scored 75 or less on a mathematics test. If 75 is

Question 67705: A) In a set of test scores, nine scores are above the 40th percentile. How many test scores are in this set.

B) Nine students scored 75 or less on a mathematics test. If 75 is the 25th percentile, what is the number of students who took this test.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A) In a set of test scores, nine scores are above the 40th percentile. How many test scores are in this set.
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If 40% are below the given score, 60% must be above it.
EQUATION:
Let x be the total number of scores.
0.60x=9
x=15 (this is the total number of scores)
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B) Nine students scored 75 or less on a mathematics test. If 75 is the 25th percentile, what is the number of students who took this test.
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Let x be the total number of students.
0.25x=9
x=36 (total number of students)
Cheers,
Stan H.
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