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n = 5 + 20 + k + 26 + 7 = 58 + k
L = 161 - 0,5 = 160,5
∑Fs = 5 + 20 = 25
F = k
k = 5
Median = L + ((1/2)n - ∑Fs).k/F
= 160,5 + ((1/2)(58 + k) - 25).5/k
= 160,5 + (29 + k/2 - 25).5/k
= 160,5 + 20/k + 5/2
= 163 + 20/k
163 + 20/k = 163,5
20/k = 163,5 - 163
20/k = 0,5
20 = 0,5k
k = 40