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**phabreel** Hey i've got this poisson question that i'm not sure how to answer:

A bottling factory finds that the number of breakdowns on its automated production line averages 1.7 per eight hour shift. This is constant for all three shifts.

a) What is the probability of exactly two breakdowns during the night shift?

b) What is the probability of less than four breakdowns during the afternoon shift?

c) What is the probability of no breakdowns during three consecutive shifts?

[snip]

I have calculated for two breakdowns which i put as P(2) = 1.01818 x 2.89/2 = 1.4714.

[font=Times New Roman][size=3]However i'm slightly unsure about this type of question, i'd really appreciate some advice thank you