1.

If the mean of the observation x, x+3, x+5, x+7 and x+10 is 9, then mean of the last three observations isA. `10""1/3`B. `10""1/2`C. `11""1/3`D. `11""2/3`

Answer» Correct Answer - c
`(x+x+3+x+5+x+x+7+x+10)/5= 9 Rightarrow 5x +25 =45 Rightarrow 5x =20 Rightarrow 20 Rightarrow x=4`
Last 3 observations are 9,11,14
Their mean `= (9+11+14)/3= 34/3 = 11""1/3`


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