If this is a trick question then it would be 8,because she would have lost the others to buy more pencils. If it is not a trick question then the answer would be 19.
Answer:
<em>C. Omitted variable bias
</em>
Step-by-step explanation:
In mathematics and statistics, omitted-variable bias (OVB) happens if one or more important variables is left out by a statistical model.
The bias results in the equation being related to the expected effects of the included variables by the influence of the excluded variables.
Let's say the data set is:
a, b, c, d, e, f, g, 61, h, i, j, k, l, m, n
If we add another number,
a, b, c, d, e, f, g, 61, h, i, j, k, l, m, n, o
You can see the median changes. So adding another number would change the median.
Hope this helped! Please comment or DM me if you have anymore questions or don't understand :)