Everything Maths Grade 11

18.4 CHAPTER 18. STATISTICS

(a) Decide on an interval width and state whatyou observe about yourchoice.

(b) Give your lowest interval.

(c) Give your highest interval.

(d) Construct a cumulative frequency graph anda frequency polygon.

(e) Compare the cumulative frequency graph and frequency polygon.

(f) Below what value do 53% of the cases fall?

(g) Below what value of 60% of the cases fall?

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(1.) 015n (2.) 015p

18.4 Distribution of Data EMBEB

Symmetric and SkewedData EMBEC

The shape of a data set is important to know.

DEFINITION: Shape of a data set

This describes how thedata is distributed relative to the mean and median.

• Symmetrical data sets are balanced on either side of the median.


• Skewed data is spreadout on one side more than on the other. It can be skewed right or skewed
  left.

skewed right

skewed left