The frequency of three numbers 12 , 15 , 17 are x+2 , x , x-1 . If the mean of this data is 13.9 then find the value of x .
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Answer:
xf fx 3x 3x 5x+2 5x+10 6x-8 6x-48 4x+6 4x+24 xˉ=n∑fx
where n=The sum of the frequency
Given xˉ=4
∴4ˉ=4x18x−14
⇒16x=18x−14
⇒16x−14x=−14
⇒−2x=−14
⇒x=−2−14=7
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