Question

AB = BC = 5 cm and AC = 3 cm. Measure angles A and C. Is ∠A = ∠C?

Answer 1

Answer:

Step-by-step explanation:

Find the mean of all values ... use it to work out distances ... then find the mean of those distances!

In three steps:

1. Find the mean of all values

2. Find the distance of each value from that mean (subtract the mean from each value, ignore minus signs)

3. Then find the mean of those distances

Like this:

Example: the Mean Deviation of 3, 6, 6, 7, 8, 11, 15, 16

Step 1: Find the mean:

Mean =   3 + 6 + 6 + 7 + 8 + 11 + 15 + 168   =   728   = 9

Step 2: Find the distance of each value from that mean:

Value Distance from 9

3 6

6 3

6 3

7 2

8 1

11 2

15 6

16 7

Which looks like this:

mean deviation

(No minus signs!)

Step 3. Find the mean of those distances:

Mean Deviation =   6 + 3 + 3 + 2 + 1 + 2 + 6 + 78   =   308   = 3.75

 

So, the mean = 9, and the mean deviation = 3.75

It tells us how far, on average, all values are from the middle.

In that example the values are, on average, 3.75 away from the middle.

For deviation just think distance

Formula

The formula is:

Mean Deviation =  Σ|x − μ|N