Final answer:
Eva's teacher could be using either the mean (81.33%) or the median (82%) to calculate her grade, as there is no mode in her test scores.
Step-by-step explanation:
To determine whether Eva's teacher is using the mean, median, or mode to calculate grades, we must first understand what each of these measures represent:
The mean is the average of a set of numbers, calculated by adding up all the numbers and then dividing by the count of the numbers.The median is the middle value of a set of numbers when they are arranged in order.
The mode is the number that appears most frequently in a set of numbers.
Considering Eva's scores of 76%, 86%, and 82%, we calculate the mean by adding these scores and dividing by three:
(76 + 86 + 82) / 3 = 244 / 3 = 81.33%
This is the mean score. For the median, we arrange the scores in order (76, 82, 86), and the middle score is 82%, which is the median. In this case, there is no repeated number, so there is no mode. Given these calculations, to answer the question, if Eva's teacher was calculating the grades using:
Mean: The grade would be 81.33%
Median: The grade would be 82%Mode: Not applicable, as there is no repeating score
None of the above: Not likely, as both mean and median are valid for these calculations