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Mathematics and statistics

Rule of thumb formula

Rule of thumb formula.

Rule of thumb image

One divided by the square root of n.

Rule of thumb image

One divided by the square root of n.

Normal distribution graph.

A graph entitled ‘Two normal distributions’ consisting of two overlapping bell-shaped curves, with a horizontal (x) axis of probability from 0 to 100% and an unlabelled vertical (y) axis. The first (solid line) bell curve indicates a normal distribution with mean of 50 and standard deviation of 15. As such, it is symmetrical and centred at 50. The second (dashed line) bell curve indicates a normal distribution with mean of 50 and standard deviation of 10. This curve is also symmetrical and centred at 50; however, its central peak is lower and its ‘shoulders’ are wider.

Poisson distribution graph

Poisson distribution graph.

Poisson

e to the power of negative lambda times lambda to the power of x divided by x factorial

Prob density graph

Probability density graph.

Prob density graph2

Probability density graph 2.

Prob function

Probability function.

Prob function 2

Probability function 2.

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