Call Ratings
| 1 Star | 2 Stars | 3 Stars | 4 Stars | Total | |
|---|---|---|---|---|---|
| Employee A | 16 | 49 | 72 | 8 | 145 |
| Employee B | 4 | 10 | 22 | 34 | 70 |
| Employee C | 8 | 56 | 45 | 16 | 125 |
| Employee D | 22 | 42 | 84 | 12 | 160 |
| Total | 50 | 157 | 223 | 70 | 500 |
A supervisor at a call center reviewed 500 calls taken by four employees and rated each call on a scale from 1 star to 4 stars. According to the table, to the nearest whole percent, what percent of Employee A’s calls received a rating of 1 star?
In a two-way table, a question asking for a percent “of” one group makes that group the whole. Find its row or column total, then find the cell for the requested category. Divide the cell count by the group total and use Desmos to convert to a percent. The grand total would answer a different question.
Hints
- Hint 1
The reference whole is the group treated as . The phrase “of Employee A’s calls” limits the whole to that employee’s row. What total appears at the end of the row?
- Hint 2
The part must meet both conditions: Employee A took the call, and the call received 1 star. Find the cell where that row and column meet.
Step-by-step
Use the employee’s row as the whole
Step 1Find the part and the whole
Employee A’s row has calls in total. Where that row meets the 1 Star column, the table shows calls. The words “of Employee A’s calls” make the whole, not the calls taken by everyone. Keep the part and whole in the same group.
- Step 2
Write the percent calculation
A percent means “out of ,” so divide the calls with 1 star by all of Employee A’s calls, then multiply by :
Using as the denominator would find a percent of all employees’ calls instead.
- Step 3
Calculate and round
Type into Desmos. It displays about , so round to the nearest whole percent: of Employee A’s calls received a 1-star rating. Choice B.