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Joint Entrance Examination
Mathematics
Probability
Question 276
Question 276 of 417
Medium
MCQ
A telephone enquiry system gets Poisson-distributed calls, mean 5 per 10 minutes. Find the probability of at most one call in a 10-minute period.
A
6
/
5
e
6/5e
6/5
e
B
5
/
6
5/6
5/6
C
6
/
5
5
6/5^5
6/
5
5
D
6
/
e
5
6/e^5
6/
e
5
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Official solution
\[P(X\le1) = e^{-5}+5e^{-5} = \frac{6}{e^5}\]
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