Question

plz answer this question ​

Answer 1

Answer:

36

Step-by-step explanation:

mean of 25 observation= 36

sum of 25 observation= 36*25=900

mean of first 13 observation= 32

sum of first 13 observation= 32*13=416

mean of last 13 observation= 40

sum of last 13 observation= 49*13=520

Now,13th observation

= ( sum of first 13 observation) + ( sum of last 13 observation)-( sum of 25 observation)

= (416+520)-900=936-900

= 36

hence,the 13th observation is 36