-The mean of 10 observations is 21. If each observation is multiplied by 4 and 5 is subtracted from each of them, then the mean will be

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Question:

-The mean of 10 observations is 21. If each observation is multiplied by 4 and 5 is subtracted from each of them, then the mean will be

A.

79

B.

81

C.

84

D.

16

Answer» a. 79

Note: The above multiple-choice question is for all general and Competitive Exams in India.