In a Poisson distruibution mu=4...

Hi lifesavers! I need some assistance. I need a formula so I can solve the following:

**In a Poisson distribution where mu=4:**

a)What is the probability x=2?

b)What is the probability x is less than or equal to 2?

c)What is the probability x is greater than 2?

THANK YOU SO VERY MUCH! I appreciate your help tremendously!

Some additional questions on that...

Me again. I was wondering how you calculated that n=10 and p=.4. Also, my options for all three parts are:

a)0.7619

b)0.1465

c)0.2381

d)0.2456

Those are all different from the answers you gave me. This stuff is so confusing to me!!!!

Thank You Thank You Thank You!

I am seriously ecstatic right now. You have no idea how much you have helped me! I cannot say enough how great it is that you spent the time customizing that calculator for me and replying to my questions! You are amazing and I thank you from the bottom of my heart!!

Ashley