answer me i can't solve this
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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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