Math, asked by yashwar, 1 year ago

answer me i can't solve this

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Answered by littyissacpe8b60
0

x₁ = 11 + 13/2 = 12                 f₁x₁ = 7 x 12 = 84

x₁ = 13+ 15/2 = 14                 f₁x₁ = 6 x 14 = 84

x₁ = 15+17/2 = 16                  f₁x₁ = 9 x 16 = 144

x₁ = 17+19/2 = 18                  f₁x₁ = 13 x 18 = 234

x₁ = 19 + 21/2 = 20               f₁x₁ = f x 20 = 20f

x₁ = 21 + 23/2 = 22              f₁x₁ = 5 x 22 = 110

x₁ = 23 + 25/2 = 24             f₁x₁ = 4 x 24 = 96


∑f₁ = 44 + f           ∑f₁x₁ = 752 + 20f


mean =  

18  =     752 + 20f  

             44 + f


18(44+f) = 752 + 20f

792 + 18f = 752 + 20f

2f = 40

f = 20


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