The mean of 25 observations is 36- Out of these observations the mean of first 13 observations is 32 and that of the last 13 observations is 40- the 13th observation is -23384036

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Toppr Admin · Accepted Answer

Mean of 25 observations -36Sum of 25 observations - 36-xD7-25-900Mean of first 13 observations- 32Sum of first 13 observations - 32-xD7-13-416Mean of Last 13 observation-40Sum of Last 13 observations - 40-xD7-13 - 520

The mean of $25$ observations is $36$ . Out of these observations if the mean of first $13$ observations is $32$ and that of the last $13$ observations is $40$ , the $13$ th observation is :
$23$
$38$
$40$
$36$

Mean of $25$ observations = $36$
Sum of $25$ observations = $36 \times 25 = 900$
Mean of first $13$ observations= $32$
Sum of first $13$ observations = $32 \times 13 = 416$
Mean of Last $13$ observation= $40$
Sum of Last 13 observations = $40 \times 13$ = $520$

The mean of 25 observations is 36. Out of these observations if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is :23384036

Mean of 25 observations =36Sum of 25 observations = 36×25=900Mean of first 13 observations= 32Sum of first 13 observations = 32×13=416Mean of Last 13 observation=40Sum of Last 13 observations = 40×13 = 520

The mean of $25$ observations is $36$ . Out of these observations if the mean of first $13$ observations is $32$ and that of the last $13$ observations is $40$ , the $13$ th observation is :
$23$
$38$
$40$
$36$

Mean of $25$ observations = $36$
Sum of $25$ observations = $36 \times 25 = 900$
Mean of first $13$ observations= $32$
Sum of first $13$ observations = $32 \times 13 = 416$
Mean of Last $13$ observation= $40$
Sum of Last 13 observations = $40 \times 13$ = $520$