1. Mean Mean  = Sum of all the values The number of values Eg. Find the mean of the following values: 2, 5, 4, 7, 5, 7, 8, 4, 5, 6, 12, 2, 4, 5, 7, 5 Mean  = 2+5+4+7+8+4+5+6+12+2+4+5+7+5 16 Mean  = 76 16 = 4.75

2. Median Median is the middle number Eg. Find the median of the following values: 2, 5, 4, 7, 5, 7, 8, 4, 5, 6, 12, 2, 4, 5, 7, 5 Median at (16+1)  2 = 8.5 8 th number is 5 9 th number is 5 Median is 5 1. Put the numbers in increasing order 2, 2, 4, 4, 4, 5, 5, 5, 5, 5, 6, 7, 7, 7, 8,12 2. Count how many numbers and add 1, then divide by 2

3. Mode Mode is the number which occurs most often Eg. Find the mode of the following values: 2, 5, 4, 7, 5, 7, 8, 4, 5, 6, 12, 2, 4, 5, 7, 5 There are 2 twos, 3 fours, 5 fives, 1 six, 3 sevens, 1 eight, 1 twelve Mode is 5 because there are more fives than anything else 1. Put the numbers in increasing order 2, 2, 4, 4, 4, 5, 5, 5, 5, 5, 6, 7, 7, 7, 8,12 2. Count how many there are of each number