A.what is the value of R?

I got 0.1 but not sure how exactly got it, and is 0.1 correct?

B.what is the probability that exactly 2 serious accidents will occur in any 2-year period?

I used this formula

(e^-R*R^k)/k!=(e^0.2*0.2^2)/2!=0.01637.... so about 1.6%

is this correct? can anyone correct the formular and teach me how to solve this one using proper mathy way.

many thanks in advance.

The last question.

I can't really recall the concept of this matter.

X is a random variable distibuted as Geo(p). Find the distribution function of X?

thank you!!