Question

The mean of 25 observations is 9 . If eqch onsevation is increased by 4, then the new mean is

Answer 1

Answer:

Step-by-step explanation:

If each observation is increased by x, the. mean also increases by x.

Here, each observation is increased by 4. So mean will increase by 4.

New mean = 9 + 4 = 13

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Solution:

number of observations = 25

mean = 9

Sum of observations = 25 × 9 = 225

Now, if each observation is increases by 4, increase in sum of observation = 25×4 = 100

New sum = 225 + 100 = 325

new mean = 325/25 = 13