the mean of the following frequency distribution is 20 determine the value of x
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I think it's the answer
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Therefore the value of x=1.5
Step-by-step explanation:
Class Frequency(f) Mid class(x) fx
0-10 5 5 25
10-20 6x 15 90x
20-30 3x 25 75x
30-40 x 35 35x
40-50 2x 45 90x
____ _____
Σf=5+12x Σfx=25+290x
But given that the mean of the distribution is 20
∴
⇒(25+290x)=20(5+12x)
⇒25+290x=100+240x
⇒290x-240x=100-25
⇒50x=75
⇒x=1.5
Therefore the value of x=1.5
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