Mathematics, 17.07.2020 07:01 MorallyGray
Finding Variance
Cara computes the mean and variance for the set 87, 46, 90, 78, and 89. She finds the mean to be 78. Her steps for
finding the variance are shown below.
o?
(87 - 78)2 + (46-78)2 + (90 - 78)2 + (78 - 78)2 + (89-78)
5
(9)2-(32)2 + (12)? + 0 + (11)3
5
o2 = 81-1024 + 144 +0+121
5
-678
= - 135.6
What is the first error Cara made in computing the variance?
Answers: 3
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Finding Variance
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