Math Lab
← All labs

Mean of Three Numbers

Data · Class V

Find the average of three scores.

70
type a value
0100
85
type a value
0100
60
type a value
0100
Live values
  • Sum215
  • Mean71.6667
  • Range (max-min)25
Live readout
Sum215
Mean71.6667
Range (max-min)25
Score 170
Score 285
Score 360

Formulas in this lab

  • Sum
    a+b+ca+b+c
  • Mean
    (a+b+c)/3(a+b+c)/3
  • Range (max-min)
    max⁡−min⁡\max - \min
Tip: Mean balances all the values , total divided by count!

Frequently asked questions

▶What is the mean of numbers?

The mean, also called average, is the sum divided by how many numbers there are. The mean of 4, 6 and 8 is (4 plus 6 plus 8) divided by 3, which is 18 divided by 3, equal to 6.

▶How do I use this mean lab?

Set three numbers with the sliders. The lab adds them and divides by 3 to give the mean. The final answer is shown alongside the working.

▶When do we use the mean?

To find your average marks in three tests of 70, 80 and 90, take the mean: 80. The average runs of a batsman or average price of three vegetables also use the mean.

▶Tip about the mean

The mean always sits between the smallest and the biggest number. If your answer is bigger than the largest or smaller than the smallest, you have made a mistake. A quick check that saves marks.