A student is trying to register for the spring semester If t

A student is trying to register for the spring semester. If the probabiliy of connecting sucessfully to the internet is only 0.02, what is the probability it will take more than three tries to connect?

a) 0.941

b) 0.014

c) 0.059

d) 0.986

Solution

p =0.02

P(X>3) = 1 -P(X=1) - P(X=2) - P(X=3)

= 1 - 3C1*(0.02)^1 * (0.98)^2 - 3C2*(0.02)^2 * (0.98)^1 - 3C3*(0.02)^3 * (0.98)^0

= 0.941 Answer (a)