1
Q
Mode/model class
A
Value of the class that occurs the most
2
Q
Median
A
The middle data value when they are put in order
3
Q
Mean
A
Calculated by x(bar) = Σx/n
4
Q
Mean in a frequency table
A
x(bar) = : = Σxf/Σf
5
Q
Lower quartile
A
Q¹= ¼n
6
Q
Upper quartile
A
Q³=¾n
7
Q
Range
A
Difference between the largest and smallest data value
8
Q
Interquartile range(IQR)
A
Q³-Q¹
9
Q
Interpercentile range
A
The difference between the values of the 2 given percentiles
10
Q
Variance σ²
A
MSMSM
Σx²/n - (Σx/n)²
11
Q
Standard deviation σ
A
√variance
Edexcel A Level Maths
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