Mean
To find the mean of a group of numbers we
find their average
example: A group of numbers 1,3,8,6,8
mean = (1+3+6+8+8)/5 = 5.2
Median
To find the median of a group of numbers we arrange
the numbers in increasing order and look for the number
in the middle.
example: A group of numbers 1,3,8,6,8
re-arrange: 1,3,6,8,8
6 being in the middle is the median.
Mode
To find the mode we look for the number which appears
for the most number of times in a group of numbers.
example: A group of numbers 1,3,8,6,8
8 is the number which appears twice, which is more than the other numbers in the list hence it is the mode.
Range
To find the range we find the difference between the
largest number and the smallest number in the group.
example: A group of numbers 1,3,8,6,8
8 is the largest and 1 the smallest number
hence range is 8 – 1 = 7