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Binomial & Poisson Distributions · Question 48 of 68

Question 48

EasyOriginal question

Accidents at a crossing follow a Poisson distribution with an average of 0.5 a day. What is the expected number of accidents in 30 days?

Options for question 48

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. The mean adds over days: 0.50.5 a day for 30 days.

  2. 0.5×30=150.5 \times 30 = 15.

Worth noting

60 divides by 0.5 instead of multiplying.

Concept
The mean over a longer period
Typical time
60 s
Your time
—
The rule this testsThe Poisson distribution
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Ten questions from Binomial & Poisson Distributions, at your own pace.

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Ten questions from Binomial & Poisson Distributions, at your own pace.

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