Mean of $31$ observation is $65$ .If mean of first $15$ observation is $64$ and that of last $15$ observation is $66$ ,then the sixteenth observation is

66

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65

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64.5

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62.55

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Solution

The correct option is B $65$
16th observation $= 31 \times 65 - 15 \times 64 - 15 \times 66$
$= 2015 - 960 - 990 = 65$

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Mean of 31 observation is 65 .If mean of first 15 observation is 64 and that of last 15 observation is 66 ,then the sixteenth observation is

The correct option is B 6516th observation =31×65−15×64−15×66=2015−960−990=65

Mean of $31$ observation is $65$ .If mean of first $15$ observation is $64$ and that of last $15$ observation is $66$ ,then the sixteenth observation is

The correct option is B $65$
16th observation $= 31 \times 65 - 15 \times 64 - 15 \times 66$
$= 2015 - 960 - 990 = 65$