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What assumption have you made in answering part b​

What assumption have you made in answering part b​-example-1
User ZaTricky
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You're assuming that this data set represents all of Mrs. Hassaan's pupils. Certain students could be missing from the histogram - for instance, there could be one or two students who missed the test, but for certain reasons will be taking a make-up exam. Their grade would not be recording in this data set, but they still contribute to the class size, and so would be unaccounted for here.

User Oleh Zayats
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