Question

rosa’s work finding the median of a set of test scores is shown below. {80, 70, 90, 80, 90, 65, 100, 100, 90} which statement best describes rosa’s first error? she should have reordered the elements from least to greatest. she should have added the elements and divided by 9. she should have counted repeated elements only once. she should have found the difference between the first and last elements.

Explanation:

Step1: Recall the definition of median

The median of a set of data is the middle - value when the data is ordered from least to greatest.

Step2: Analyze Rosa's work

Rosa did not re - order the elements from least to greatest first. For example, the set \(\{80,70,90,80,90,65,100,100,90\}\) should be reordered as \(\{65,70,80,80,90,90,90,100,100\}\) before finding the median.

Answer:

She should have reordered the elements from least to greatest.