Normal Distribuations
- Created by: eleanor
- Created on: 11-04-15 15:30
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- Normal Distributions
- Properties
- mean=mode=median
- x axis is an asymptote
- goes from -? to ?
- area = 1
- symmetrical
- +1SD= 65% +2SD= 95% +3SD= 99%
- To Standardised
- the random variable X that has a normal distribution with mean µ and standard deviation can be represented by
- X ~ N(µ, )
- standardised graph is Z ~ N(0,1)
- to get standard sub numbers into formula
- (X- ) =Z
- once you have the standardised form you can use the table to find the area
- when using the table you get the value of the area to the left
- the smaller table is the area to the right of the line and can be used for percentages
- Properties
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