Chapter 11 • Class 7 Mathematics
Statistics (Measures of Center & Variability)
Study by topic — one focused page each
1
Mean, Median, Mode, Range
Measures of Center describe the typical value in a dataset. Measure Definition Example: {2,4,4,6,9} Mean Sum divided by count (2+4+4+6+9)=25 / 5 = 5 M…
Start this topic → 2Mean Absolute Deviation (MAD)
Mean Absolute Deviation (MAD) measures how spread out the data is — the average distance each data point is from the mean. Steps to calculate MAD: Fin…
Start this topic → 3Box Plots — Five-Number Summary
A box plot displays data distribution using five key values: Value Meaning Minimum Smallest value in the dataset Q1 First quartile — median of the low…
Start this topic → 4Random Sampling & Population Inferences
Population : The entire group being studied. Sample : A subset of the population used to make inferences about the whole. Random sampling gives every …
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