1.

Find the missing information in the following table: `{:(,,A,,B,,C,,"Combined"),("Number(N)",,10,,8,,-,," "24),("Mean"(barX),,20,,-,,6,," "15):}`

Answer» Missing number for C = 24 - (10+8) = 6
Let mean for B = x
We know that,
`barX_(123)=(barX_(1)N_(1)+barX_(2)N_(2)+barX_(3)N_(3))/(N_(1)+N_(2)+N_(3))`
`:. " "15=((20xx10)+(8xxx)+(6xx6))/24`
`200+8x+36=15 xx 24`
`rArr" "236+8x=360`
`rArr" "8x=360-236`
`rArr" "8x=124`
`rArr" "x=(124)/8`
`rArr" "x = 15.5`
Thus, Missing Number for C = 6.
Mean of B = `15.5`.


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