Analysis and Approaches for IBDP Maths Ebook 1 | Seite 243

Front Page
Exercise 78
1. In a group of 30 students, 21 take physics and 13 take chemistry. 9 students take both
physics and chemistry, as shown in the following Venn diagram. The values a and b
represent numbers of students.
(a)
Find the value of
(b)
(i) a ;
(ii) b .
[4]
A student is selected at random. Find the probability that he takes chemistry only.
[2]
18
2. In a group of 40 students, 17 are in the choir and 15 are in the school band. 10 students
are neither in the choir nor in the band, as shown in the following Venn diagram. The
values h and k represent numbers of students.
(a)
Find the value of
(i) h ;
(b)
(ii) k .
[4]
A student is selected at random. Find the probability that he is in both the choir
and the school band.
[2]
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