The average test marks in a particular class is 79. The standard deviation is 8. If the marks are distributed normally, how many students in a class of 200 did not receive marks between72 and 82. Givenwhere Z is a standard normal variable.
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⇒average mark obtained by each student =51+68÷8+9=7
⇒Hence each student gained gained an average of 7 marks
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Answer:
7 marks is the answer.
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