The Math Meridian
Back to Grade 6

Mean, median, mode, range and outliers

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Learn it Total = mean × count, so you can find a missing value or a new mean. One extreme value (outlier) changes the mean a lot but the median very little.

Example: Your 4 marks are 70, 82, 75, 81. What do you need next for a mean of 80?

  1. Needed total for 5 tests: $80 \times 5 = 400$.
  2. So far: $70 + 82 + 75 + 81 = 308$.
  3. Need $400 - 308 = 92$.

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