Explanation:
Success having a photocopier = use the binomial model
Success = $8! / 4! (8 - 4)! \times 0.8^4 \times 0.2^{8-4}$
Success = $40,320 / 576 \times 0.4096 \times 0.0016$
Success = 0.0458
(Book 2, Module 14.1, LO 14.a)
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Question 42
A recent study indicated that 80% of all businesses had a photocopier. Assuming a binomial probability, what is the probability that exactly four businesses will have a photocopier in a random selection of eight businesses?
A
0.046.
B
0.056.
C
0.066.
D
0.076.
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