Let X = the number of days it rains in a week.
p = probability that it rains
The p.m.f of X is given by
(i) P(it rains exactly 3 days of week) = P(X = 3)
Hence, the probability that it rains exactly 3 days of week = 0.2903.
(ii) P(it will rain at least 2 days of the given week)
Hence, the probability that it rains at least 2 days of a given week = 0.8414.