I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it!

A woman is fishing for bass on Pinelands pond. Let x=number of 'keepers' that she catches in an hour. The probability distribution for x is given in the table below

x= 0 1 2 3 4 5

p(x)= .1 .2 .3 .2 .1 .1

Questions:

a) What is the probability that she catches at most 4 keepers?

b) What is the probability that x is greater to and equal to 3?

c) Find Ux, the mean number of keepers caught

d) Find the standard deviation for X, the number of keepers caught