The graph illustrates the distribution of test scores taken by College Algebra s

Question

The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 130, while the mean score was 71 and the standard deviation was 14 29 43 57 71 85 99 113 Distribution of Test Scores What is the approximate percentage students who scored between 57 and 85 on the test? What is the approximate percentage of students who scored between 71 and 85 on the test? What is the approximate percentage of students who scored between 43 and 99 on the test? What is the approximate percentage of students who scored less than 43 on the test? Get help Videol Video Points possible: 1 This is attempt 1 of 1 DOLL 5 6 8 0

Explanation / Answer

as z score =(X-mean)/std deviation

1)

P(57<X<85)=P(-1<Z<1)=68.26%

2)P(71<X<85)=P(0<Z<1)=34.13%

3)P(43<X<99)=P(-2<Z<2)=95.45%

4)P(X<43)=P(Z<-2)=2.28%

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