the mean of five number is 10. if each number is decreased by 3,mean of the new numbers.

Let a, b, c, d and e be the 5 numbers.Now. mean = 10a+b+c+d+e5 = 10a+b+c+d+e = 50Now, when each number is decreased by 3, we getnew mean = a-3+b-3+c-3+d-3+e-35 = a+b+c+d+e  - 155 = 50-155 = 355 = 7

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