Last term Abraham sat three tests in each of his science subjects. His raw percentage marks for the tests, in the order they were completed, are listed.

a. Calculate the variance of Abraham’s marks in each of the three subjects.

b. Comment on the three values obtained in part a. Do the same comments apply to Abraham’s mean mark for the tests in the three subjects? Justify your answer.

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Biology Chemistry Physics 21 33 45 41 53 65 51 63 75