Question

The average of seven numbers is 21 if each number is increased by 2 the new average is

Answer 1

Answer:

The average of seven numbers is 21

Let the seven numbers be x1,x2,......x7

Each number is multiplied by 2

the new numbers are 2x1,2x2,.....2x7

mean = 2 (x1+x2+x3......+x7) /7 = 2×21 = 42

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