Question

The number of computer shutdowns during any month has a poisson distribution, averaging 0.25 shutdowns per month.

What is the probability of at least 3 computer shutdowns during the next year?

Answer 1

.25 shutdowns per month = 3 shutdowns per year.
you can use 3 as your lambda

Answer 2

lamba is 3 or 3/12?

Answer 3

lambda is 3
$$\Large { P(X\ge 3 ) = 1 - P( X < 3 )
\\= 1-(P(0)+P(1)+P(2))
}$$

Answer 4

is it e^-3 X (3^0/0!)

Answer 5

yes that would be for P(0)

Answer 6

okay, thank you...

Answer 7

this is the 2nd question
During the next year, what is the probability of at least 3 months (out of 12) with exactly 1 computer shutdown in each?

Answer 8

@perl