1.A medical professional wants to know what percent of students will spend time doing post grad research. he has the following probability distribution

A. complete the table

b. whats the expected value

c. find the standard deviation

D. find p(x>4)

X	P(x)	x (p) (x)
1	0.05
2	0.10
3	0.25
4	0.20
5
6		0.90