The mean of 25 observations is 36. The mean of first 13 observations is 32 and that of last 13 observations is 39. What is the value of 13th observation.
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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
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