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The arithmetic mean of 10 number is-7. If 5 is added to every number, then the new Arithmetic mean is
Given that, arithmetic mean of 10 numbers = -7
We know, total number of observations, n = 10
Then, mean is given by
⇒ Sum of all observations = 10 × -7 = -70
According to question, if 5 is added to every 10 number then,
New sum of all observations = Old sum + (5 × 10)
⇒ New sum = -70 + 50 = -20
⇒ New mean = -2
Thus, option (A) is correct.
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