Question 473883
I will answer only the first three.  I know you'll get the idea for the remaining ones...

{{{mu = (1/75)*60 = 60/75 = 0.8}}}
(a) {{{P(0) = e^(-0.8)*(0.8^0/0!) = 0.4493}}}

(b) {{{P(4) = e^(-0.8)*(0.8^4/4!) = 0.00767}}}

(c) {{{P(3) = e^(-0.8)*(0.8^3/3!) = 0.038343}}}