To easily find the mean, median, mode, and range, here are some simple steps for Year 11 students:

1. Mean: This is just the average. To find it, add all the numbers together and then divide by how many numbers you have. For example, with the numbers $[3, 5, 7]$, you would do this:
   $(3 + 5 + 7) / 3 = 5$.

2. Median: This is the middle number. First, put the numbers in order from smallest to largest.

   • If there’s an odd number of values, the median is the one right in the middle.
     For example, in $[1, 3, 4, 6, 8]$, the median is $4$.
   • If there’s an even number of values, like in $[1, 3, 4, 6]$, you take the two middle numbers (which are $3$ and $4$) and find their average.
     So, $(3 + 4) / 2 = 3.5$.

3. Mode: This is the number that appears the most often. For example, in the list $[2, 3, 3, 5]$, the mode is $3$ because it shows up twice.

4. Range: This tells you the difference between the biggest and smallest numbers. To find it, subtract the smallest number from the biggest number.
   For example, with the numbers $[2, 5, 9]$, you do $9 - 2 = 7$.

Make sure to practice with different sets of numbers to get faster at these calculations!