Question

The mean of 12 observations is 25. If observations 13 and 21 are removed, then what is the mean of the remaining observations?​
septs are important​

Answer 1

Answer:

The mean is 26.6

Explanation:

Given,

Mean of 12 observations = 25

No. of observations = 12

Therefore,

Sum of observations = 25 × 12

= 300

Now,

If observations 13 and 21 are removed

Then,

Sum of observations = 300 - 13 - 21

= 300- 34

= 266

Therefore, no. of observations = 12 - 2

= 10

Now, new mean of 10 numbers =

Sum of observations ÷ No. of observations

= 266 ÷ 10

= 26.6