Calculations with the Mean

Calculations with the Meanvideo

Calculations with the mean

How do I solve harder problems involving the mean?

• Remember what the mean is

  • Mean = total of values ÷ number of values

    • It is a formula involving three quantities

    • if you know any two, you can find the other one

• A question may require you to work backwards from a known mean

  • It helps to rearrange the formula

  • Total of values = mean × number of values

• Find the total of the values before and after to help with question that involve: 

  • missing values

  • adding in, or taking out, a value