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Unformatted text preview: n would be a better estimate of the density of the earth. The median is not affected by a few
outliers. Mind Expanding Exercises
2 ⎛9 ⎞
⎜ ∑ xi ⎟ = 559504
⎝ i =1 ⎠ 9 695 ∑ xi2 = 62572
i =1 n=9 2 ⎛9
⎞
⎜ ∑ xi ⎟
9
∑ xi2 − ⎝ i=1 n ⎠ 62572 − 559504
9
s 2 = i =1
=
= 50.61
n −1
9 −1
s = 50.61 = 7.11
Subtract 30 and multiply by 10
2 9 ∑x
i =1 2
i = 2579200 ⎛9 ⎞
⎜ ∑ xi ⎟ = 22848400
⎝ i =1 ⎠ 658 n=9 2 ⎛9
⎞
⎜ ∑ xi ⎟
9
∑ xi2 − ⎝ i=1 n ⎠ 2579200 − 22848400
9
s 2 = i =1
=...
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 Spring '14

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