Trails

Marks of past adventurers

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January
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February
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March
183
April
58
May
61
June
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July
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August
n=3∑x=15∑f=302∑fx=1388∑x2=77∑f2=40574xˉ=∑fx∑x=4.60fˉ=1n∑f=100.67σf2=Var(F)=3390.89 \begin{align*} && n &= 3 \\[1em] \sum x &= 15 \quad&\quad \sum f &= 302 \quad&\quad \sum fx &= 1388 \\[1em] \sum x^2 &= 77 \quad&\quad \sum f^2 &= 40574 \\[2em] \bar{x} &= \frac{\sum fx}{\sum x} = 4.60 \quad&\quad \bar{f} &= \frac{1}{n}\sum f = 100.67 \quad&\quad \sigma^2_f &= \text{Var}(F) = 3390.89 \end{align*}