Lucia has been recording her grades on her Spanish quizzes the following is a list of her grades 74, 81, 86, 92, 74, 85, 90, 89, 78, 80 determine the mean absolute deviation of Lucy is Spanish quiz grades a 5.5 B 8.29 c 82.9 d55
To find the mean absolute deviation of Lucia's Spanish quiz grades, we first need to find the mean of her grades.
Mean = (74 + 81 + 86 + 92 + 74 + 85 + 90 + 89 + 78 + 80) / 10
Mean = 829 / 10
Mean = 82.9
Next, we need to find the absolute deviation of each grade from the mean:
|74 - 82.9| = 8.9
|81 - 82.9| = 1.9
|86 - 82.9| = 3.1
|92 - 82.9| = 9.1
|74 - 82.9| = 8.9
|85 - 82.9| = 2.1
|90 - 82.9| = 7.1
|89 - 82.9| = 6.1
|78 - 82.9| = 4.9
|80 - 82.9| = 2.9
Then, we calculate the mean of these absolute deviations:
(8.9 + 1.9 + 3.1 + 9.1 + 8.9 + 2.1 + 7.1 + 6.1 + 4.9 + 2.9) / 10
55.9 / 10
5.59
Therefore, the mean absolute deviation of Lucia's Spanish quiz grades is 5.59.