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x1 = 1, x2 = 2, x3 = 3, x4 = ?
Original stats
E0 = sum(xi) / 3, i=1..3 => E0 = 2
VAR0 = sum(xi - E0)^2 / 3, i=1..3 => VAR0 = 0.6(6)
Unknown stats
E1 = (3E0 + x4) / 4 = (x4 + 6) / 4
VAR1 = sum(xi - E1)^2 / 4 = (3x4^2 + 12x4 + 20) / 16
IF VAR0 == VAR1:
x4 = 1.06 OR x4 = 2.94
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Day 1: Standard Deviation Puzzles #1
You are viewing a single comment's thread. Return to all comments →
x1 = 1, x2 = 2, x3 = 3, x4 = ?
Original stats
E0 = sum(xi) / 3, i=1..3 => E0 = 2
VAR0 = sum(xi - E0)^2 / 3, i=1..3 => VAR0 = 0.6(6)
Unknown stats
E1 = (3E0 + x4) / 4 = (x4 + 6) / 4
VAR1 = sum(xi - E1)^2 / 4 = (3x4^2 + 12x4 + 20) / 16
IF VAR0 == VAR1:
x4 = 1.06 OR x4 = 2.94