Prelims · 8 Mental Ability · APPSC Group 2
8.6 Basic statistics and growth rates notes
3 notes, in reading order.
- 8.6.1Mean, median and mode: raw and grouped data
The mean is the total shared equally, the median is the middle value after sorting, and the mode is the most frequent value; for grouped data each has its own formula built on the class width.
Standard · 6 min · Full course - 8.6.2Range, variance and standard deviation
Measures of dispersion tell how spread out the data are around the centre: range uses only the two extremes, while variance and standard deviation use every value.
Standard · 6 min · Full course - 8.6.3Growth rates: percentage change, CAGR and index numbers
Growth is always measured against the earlier value: one period gives a percentage change, several periods give a compound annual growth rate (CAGR), and an index number turns any series into "base year = 100".
Standard · 6 min · Full course
Practise Basic statistics and growth rates. Questions with answers explained, from the same topics.
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