Question

Find the mean deviation for the observations –1, 0, 4.​

Answer 1

Answer:

Given observations are −1,0,4

Mean x = -1+0+4 = 1

_____

3

Now, deviations of x i from mean are

∣−1−1∣,∣0−1∣,∣4−1∣ i.e.2,1,3

Sum of deviations Σ∣x 1 − x∣=2+1+

3=6

Mean deviation = = n1 Σ∣x 1 − x∣= 31×

6=2