If the airthmetic mean of 8 , 4, x, 6, 2 , 7 is 7 , find the value of x.
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Kevin Hancock handrail kahugi
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Given: The mean of below observations is 7. Then find the unknown value x .
Solution: we know,
Arithmetic mean= sum of observations ÷number of observations.
= observations are 8,4,x,6,2,7.
= number of observations are 6
= by the formulae, 8+4+x+6+2+7÷ 6
= mean=7
= 7 = 8+4+x+6+2+7÷6
= 7= 27 +x ÷6
= when we transport 6 into LHS it changes into multiplication.
= 7×6 =27+x
= 42 = 27+x
= 42-27 =x
= 15 =x.
= x=15
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