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Problem: missing frequency, {{5-10,10-15,15-20,20-25,25-30,30-35},{11,20,35,20,a,6}},mean=18.1 [ Calculator, Method and examples ]

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Your problem -> missing frequency, {{5-10,10-15,15-20,20-25,25-30,30-35},{11,20,35,20,a,6}},mean=18.1

Thus, the missing frequency is 8.

 Class(1) Frequency (f)(2) Mid value (x)(3) d=(x-A)/h=(x-27.5)/5A=27.5,h=5(4) f*d(5)=(2)xx(4) 5 - 10 11 7.5 -4 -44 10 - 15 20 12.5 -3 -60 15 - 20 35 17.5 -2 -70 20 - 25 20 22.5 -1 -20 25 - 30 a 27.5 0 0 30 - 35 6 32.5 1 6 --- --- --- --- --- n=92+a ----- ----- sum f*d=-188

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

18.1 = 27.5 + (-188)/(92+a) * 5

-9.4 = (-188)/(92+a) * 5

92+a = (-188)/(-9.4) * 5

92+a = 100

a = 100 - 92

a = 8

Thus, the missing frequency is 8.

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