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(Choose 1 answer)
☐ A
On average, Binh receives 9 phone calls from his mother weekly. Assume that the number of calls follows a
Poisson distribution. Find the probability that his mother only calls him once during a two-day period.
A. 0.197
B. 0.231
C. 0.223
D. 0.218
E. None of the other choices is correct
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