Question

Dora calculated the mean absolute deviation for the data set 35, 16, 23, 42, and 19. Her work is shown below.

Step 1: Find the mean.

mean = StartFraction 35 + 16 + 23 + 42 + 19 Over 5 EndFraction = 27

Step 2: Find each absolute deviation.

8, 11, 4, 15, 8

Step 3: Find the mean absolute deviation.

M A D = StartFraction 8 + 11 + 4 + 15 Over 5 EndFraction = 9.5

What is Dora’s error?
Dora should have divided by 4 when finding the mean.
Dora found the absolute deviation of 35 incorrectly.
Dora used only four numbers in finding the mean.
Dora used only four numbers in finding the mean absolute deviation.

Answer 1

4 answer is 4

Explanation:

Answer 2

#4 (Dora only used 4 numbers in finding the MAD)

Explanation:

She found the Absolute Deviation for all 5 numbers, but only used 4 of them when calculating the Mean Absolute Deviation