Question

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Answer 1

Mean of 7th Grade Math Exam Results: 84%

Mean of 8th Grade Math Exam Results: 74.4%

Explanation:

The mean (also called an average) is obtained by adding all the terms together then dividing the result by the number of terms in the set.

96 + 74 + 81 + 94 + 75

420/5 = 84

Mean of 7th Grade Math Exam Results: 84%

73 + 60 + 86 + 72 + 81

372/5 = 74.4

Mean of 8th Grade Math Exam Results: 74.4%

Comments: The 7th graders got, on average, almost 10% more on their exams than did the 8th graders. Also, none of the 8th graders got an A, whereas two 7th graders got an A on their exam. My inference is that 8th grade math is harder than 7th grade math, so that is why the scores are lower.

I'm always happy to help :)

Answer 2

To get the mean, you add all of the numbers and then divide the sum by the number of numbers. The mean for the 7th grade math class is 84. The mean of the 8th grade class is 74.4. For the second question, an inference that you can make about the data is that the 7th grade class studied more because they have better grades.