Analysis and Approaches for IBDP Maths Ebook 1 | Page 219

Front Page
Chapter
17
17
Statistics
SUMMARY POINTs
�
Relationship between frequencies and cumulative frequencies:
Data Frequency
Data less than Cumulative
or equal to frequency
10 f 10 1
1
20 f
2
20 f1�
f2
30 f
3
30 f1 � f2 � f3
� Measures of central tendency for a data set { x1 , x2, x3, , x } arranged in
ascending order:
x � x � x � � x
x �
n
1.
1 2 3 n
: Mean
2. The datum or the average value of two data at the middle: Median
3. The datum appear the most: Mode
n
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