Distributions

What a set of numbers looks like, and the few numbers that sum it up.

Histogram and box plot

  • mean
  • median
  • a normal curve with the same mean and spread

The numbers

The box goes from Q1 to Q3, the middle half of the values, with the median inside.

The 68–95–99.7 rule

In a normal distribution about 68 % of the values lie within one standard deviation of the mean.