Measures of Central Tendency Part 2

Mean - the sum of a set of values divided by the number of values in the set

eg. set is 6, 4, 8 and the mean is...

6 + 4 + 8 = 18

18 / 3 = 6

...therefore the mean is 6

Range - the positive difference between the largest and smallest values in a data set

eg. range of 1, 3, 4, 5, 5, 6, 6, 8, 8, 9 is...

9 - 1 = 8

...therefore the range is 8

Measures of Central Tendency Part 1

Median - the middle number in a set of data have been arranged in order

eg. median of 2, 5, 6, 8, 9 is 6

Mode - the most frequently occuring number in a set of data

eg. mode of 3, 5, 7, 7, 9 is 7

d = 2r
d  = r
2
c = 2 pi r
c = pi d
A = area

- all numbers ending in 0 or 5

- the sum of the digits is divisible by 9.

Perpendicular Bisector-Separated into 2 equal parts.

Formulas

Formulas, d = diameter, r = radius, c = circumference, A = Area


d = 2r
d  = r
2
c = 2 pi r
c = pi d
A = area