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If the arithmetic mean of the following data is 7, then a + b = `{:(x_(i), 4,6,7,9),(f_(i)"",a,4,b,5):}`

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If the arithmetic mean of the following data is 7, then a + b =
`{:(x_(i), 4,6,7,9),(f_(i)"",a,4,b,5):}`
A. 4
B. 2
C. 3
D. cannot be determined
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1 Answer

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Best answer
Correct Answer - D
We have,
`7=(4a+24+7b+45)/(a+4+b+5)`
`rArr 4a+7b+69=7a+7b+63 rArr a=2`
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