maths

The mean is the total of the numbers divided by how many numbers there are.

To work out the mean:

1. Add up all the numbers.
   7 + 9 + 11 + 6 + 13 + 6 + 6 + 3 + 11 = 72

2. Divide the answer by how many numbers there are.
   There are 9 numbers.
   72 ÷ 9 = 8
   So the mean value is 8.

The mode is the value that appears the most.

To work out the mode:

1. Put the numbers in order:
   3 6 6 6 7 9 11 11 13

2. Look for the number that appears the most.
   6 appears more than any other number.
   So the mode value is 6.

The median is the middle value.

To work out the median:

1. Put the numbers in order:
   3 6 6 6 7 9 11 11 13

2. The number in the middle of the list is the median.
   So the median value is 7.

If there are two middle values, the median is halfway between them. Work out the median for this set of numbers:

3 6 6 6 7 8 9 11 11 13

There are two middle values, 7 and 8.
The median is halfway between 7 and 8, so the median is 7.5.

The range is the difference between the biggest and the smallest number.

To work out the range:

1. Put the numbers in order:
   3 6 6 6 7 9 11 11 13

2. Subtract the smallest number from the biggest number:
   13 - 3 = 10
   So the range of this set of numbers is 10.