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Content
Content
- Range
- Variance and Standard Deviation
- Frequency Distribution
Range
Range
Range = Highest value – Smallest value.
Find the Range of the following data : 9, 8, 6, 7, 5, 6, 7, 7, 5.
Range = 9 – 5 = 4.
Variance and Standard Deviation
Variance and Standard Deviation
Find the standard Deviation of the following data : 9, 8, 6, 7, 5, 6, 7.
Variance is the square of Standard Deviation.
Variance = 1.51
Frequency Distribution
Frequency Distribution
A frequency distribution has value (score) and corresponding frequency (Number of people)
Find the Mean, Median, Mode, Standard Deviation of the above data
Mean = ∑fx / ∑f = 305/37 = 8.24
Position of Median = (n + 1)/2
= (37 + 1)/2
= 19
Median = 19th Value = 8
Highest Frequency = 9.
Corresponding value is the mode.
Mode = 12.
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