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

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

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

Measures of Central Tendency

a value that represents the central of a data set

can be the mean,or mode

data set is a group of numbers that you MUST arrange in
order from least to greatest

Eg.

2,3,4,5,6,5,4,5,3,4,5,6,7,5,34,3

2,3,3,3,4,4,4,5,5,5,6,6,7,34

Rule for 8

all numbers divisible by 2 trice

Rule 4

all numbers that are divisible by 2 twice

Rule for 10

all numbers ending in zero

eg 10,20,30,40,50,60,70

Rule For 5

all numbers ending in 0 or 5

eg 5,10,15,20,25,30,35,40

Rule for 2

all even numbers are divisible by 2 even numbers end in 0,2,4,6,8 odd numbers end in 1,3,5,7,9

Rule for 6

if the number is divisible by 2 and 3 it is divisible by 6

Rule for 9

The sum of the digits is divisible by 9

Rule for 3

The sum of the digits is divisible by 3

eg 1+2+3+6=12=3

Divisibility rule 2

All even numbers are divisible by 2.
Even numbers: 0,2,4,6,8.

10 X 1000

10X1000= 10000