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Problem: mean {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}} [ Calculator, Method and examples ]

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Your problem -> mean {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}}

 Class(1) Frequency (f)(2) Mid value (x)(3) d=(x-A)/h=(x-35)/10A=35,h=10(4) f*d(5)=(2)xx(4) 10 - 20 15 15 -2 -30 20 - 30 25 25 -1 -25 30 - 40 20 35=A 0 0 40 - 50 12 45 1 12 50 - 60 8 55 2 16 --- --- --- --- --- n = 80 ----- ----- sum f*d=-27

Mean bar x = A + (sum fd)/n * h

=35 + -27/80 * 10

=35 + -0.3375 * 10

=35 + -3.375

=31.625

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