the mean of sequencially arranged 11 observations is 50. the mean of first 6 observations is 49 and the mean of last 6 observations is 52. then the sixth observation is..................
A. 55
B. 56
C. 57
D. 58
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Answer:50
Let 11 observations be:
X,X+1,X+2....X+10
Then,
(x+x+1+x+2...x+10)÷11=50
(11x+55)÷11=50
X+5=50
X=45
Therefore,sixth observations will be: x+5
So ,45+5=50
Therefore,sixth observations is 50
Step-by-step explanation:
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