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.
o2 - 187–7852 + (45–78)? +(90 - 78,2+(78–78,2 +(89 – 7832
5
2-(32)2 +
2 + (12)2 +0° +(11)
02 - 81-1024 + 144 +0 + 121
o2 = -678 = -135.5
What is the first error Cara made in computing the variance?
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