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P2 Q7
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Binomial
13 P2 Q7
2013 H2 Mathematics Paper 2 Question 7
The Binomial Distribution
Answers
(i)
The probability of a packet contains a free gift is the same for each packet
Whether a packet contains a free gift is independent of any other packet
(ii)
0.377
{0.377}
0.377
(iii)
Out of syllabus
Full solutions
(i)
The probability of a packet contains a free gift is the same for each packet
Whether a packet contains a free gift is independent of any other packet
(ii)
F
∼
B
(
20
,
1
20
)
F \sim \textrm{B}\left(20, \frac{1}{20}\right)
F
∼
B
(
20
,
20
1
)
P
(
F
=
1
)
=
0.377
(3 sf)
■
\begin{align*} \mathrm{P}(F=1) &= 0.377 \textrm{ (3 sf)} \; \blacksquare \end{align*}
P
(
F
=
1
)
=
0.377
(3 sf)
■
(iii)
Out of syllabus
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