Averages/Median/Mode/Range

Question 1

What is the formula of the average of an evenly spaced arithmetic series?

Answer 1

Avg = median = (max+min)/2

Question 2

Median

Answer 2

• A number in the set
• If n is odd the position of the median will be (n+1)/2
• If n is even the median will be the average of the two positions in the middle.

Question 3

Standard deviation depends most on…

Answer 3

The values farthest from the average (mean)

Question 4

Standard deviation

Answer 4

• sd = root(variance)

- variance = ( (x-avg)^2 + (y-avg)^2+…)/ # of items