The mean of a Poisson random variable X is μ = 9. Compute
P(μ-2σ < X < μ + 2σ).
My reasoning is as follows:
P(9-2(9) < X < 9 + 2(9)) = P(-9 < X <27) . This is all I can think about doing at the moment. Feedback would be appreciated.
The mean of a Poisson random variable X is μ = 9. Compute
P(μ-2σ < X < μ + 2σ).
My reasoning is as follows:
P(9-2(9) < X < 9 + 2(9)) = P(-9 < X <27) . This is all I can think about doing at the moment. Feedback would be appreciated.
.
Calculate . There's no easy way of doing this by hand - you just have to calculate each probability and then add them all up.
You might be able to use the rule of thumb .... It will depend on what accuracy is required.
It's more experience than smart.
That's why I make my students do the homework.
I assign a lot, but I put those same problems on the exams and quizzes.
They do their homework, they get good grades and I know they are learning. It works.