Bagaimana cara penyelesaiannya

Data = 2,2,4,5 --> n = 4

H = n / Σ(1/xi)
H = 4 / (1/2 + 1/2 + 1/4 + 1/5)
H = 4 / (10/20 + 10/2 + 5/20 + 4/20)
H = 4 / (29/20)
H = 4 x 20/29
H = 80/29