Question

What is the mean of 70 observation is 25 1st 4 is 23and the mean of the last 4 observation is 29 find the 4th observation

Answer 1

Answer:

Mean of 25 observations =36

Sum of 25 observations = 36×25=900

Mean of first 13 observations= 32

Sum of first 13 observations = 32×13=416

Mean of Last 13 observation=40

Sum of Last 13 observations = 40×13 = 520

Sum of first13 observation+ Sum of last13 obs − 13th observation= Total sum of 25 observations

416+520−13th observation=900

13 th observation =36

Step-by-step explanation:

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