Dr. ibanez recorded the amount of snowfall, in centimeters, at 10 different locations during 1 day and then arranged the amounts from smallest to largest. the amounts were 3, 3, 3, 3, 4, 4, 4, 5, 5, and 6 cm. the mean of these measurements is 4 cm.

what is the mean absolute deviation?

a.
0 cm

b.
0.8 cm

c.
1 cm

d.
2.5 cm
nmn

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.