Your Practice Paper – Analysis and Approaches SL for IBDP Mathematics
� Coding of data : 1 . Only the mean , the median , the mode and the quartiles will change when each datum of the data set is added or subtracted by a value 2 . All measures of central tendency and measures of dispersion will change when each datum of the data set is multiplied or divided by a value
18 Probability
� Terminologies : 1 . U : Universal set 2 . A : Event 3 . x : Outcome of an event 4 . nU ( ): Total number of elements 5 . nA ( ): Number of elements in A
� Formulae for probability : 1 . P ( A� B) � P ( A) � P ( B) � P ( A�
B)
2 . P ( A�) �1� P ( A)
3 .
P ( A� B)
P ( A| B) �
P ( B) 4 . P ( A) � P ( A� B) � P ( A�
B�)
5 . P ( A�� B�) � P ( A� B) � 1 6 . P ( A� B) � P ( A) � P ( B) and P ( A�B) � 0 if A and B are mutually exclusive
7 . P ( A� B) � P ( A) � P ( B) and P ( A| B) � P ( A) if A and B are independent
� Venn diagram :
1 . Region I : A�
B 2 . Region II : A B� �
3 . Region III : A��
B 4 . Region IV : ( A�
B) �
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