Question

.The average 16 observations is 25 and

average of 24 observations is 30. The

average of all 40 observation is​

Answer 1

the answer is in the picture. hope it helps.

Answer 2

The average of 16 observation is 25 so the sum of observations is :

= 16 × 25 = 400

The average of 24 observations is 30 so the sum of observations is :

= 24 × 30 = 720

Now Average of 40 observations
= Sum of all observations / Total observations

= 400 + 720 / 40

= 1120 / 40

= 28

Hence average of all 40 observation is​ 28

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