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

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


Class
`(1)`
Frequency `(f)`
`(2)`
Mid value `(x)`
`(3)`
`d=(x-A)/h=(x-35)/10`
`A=35,h=10`
`(4)`
`f*d`
`(5)=(2)xx(4)`
10 - 201515-2-30
20 - 302525-1-25
30 - 402035=A00
40 - 501245112
50 - 60855216
---------------
`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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