Question

Emi computes the mean and variance for the population data set 87, 46, 90, 78, and 89. She finds the mean is 78. What is the first error she made in computing the variance?

a) The error is in the formula for variance.
b) Emi subtracted the mean from each value incorrectly.
c) Emi used the wrong values in her calculations.
d) Emi's calculations are all correct.

Answer 1

Emi's first error in computing the variance is that she used the wrong values in her calculations.

Step-by-step explanation:

The first error Emi made in computing the variance is that she used the wrong values in her calculations.

To calculate the variance, Emi needs to subtract the mean from each value, square the result, and then calculate the average of those squared differences. However, it seems that Emi might have used incorrect values when performing her calculations.