## Friday, June 15, 2012

### Range

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

Eg.

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

1,3,4,5,5,6,6,8,8,9

9-1 = 8

### Mode

The most frequently occurring number in a
set of data

mode and most both have 4 letters

Eg.

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

mode of 2,2,4,6,6,8,11 is 2 and 6

### Median

The middle number in a set
of data after the data have been arranged in order

Eg.

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

median of 1,3,6,8,9,10 is 7

### Mean

A measure of central tendency

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

mean of 6,4,8 is

add up all the numbers and divide the results by how many numbers there are

6+4+8=18

18 divide it by 3 = 6

therefor the mean is 6

### divisibility rules

1-all number
2-even numbers
3-sum is 3
4-divisible by 2 twice
5-end in 0 or 5
6-divisible by 2 or 3
8-divisible by 2 trice
9-end in 0

### theoretical probability

Theoretical Probability- the expected probability of an event occurring.

B=Brackets
E=Exponents
D=Division
M=Multiplication
A=Addition
S= Subtraction