Question

The sum of (x+2) observation is x4-16,

find the mean of the observation​

Answer 1

Answer:

We know mean =Number of observationSum of observations.

For first 10 observations:

20=10sum1

⟹ sum1=sum of first 10 observations

⟹ sum1=20×10=200.

For another 15 observations:

16=15sum2

⟹ sum2= sum of another 15 observations

⟹ sum2=16×15=240.

Therefore, Mean of all 25 observations:

Mean=10+15sum1+sum2

⟹ Mean=25200+240=25440=17.6.

Answer 2

Answer:

Correct answer is 17.6