1. In class of 25 students 3 students failed.

What is the probability that student from this class will pass (NOT fail)?

a) 0.45

b) 0.60

c) 0.72

d) 0.88

2. If you roll two dice what is the probability that sum of numbers on two dice will be 7?

P = number of cases with sum 7 over total possible number of cases.

Keep in mind, 6-1 and 1-6 considered as two different cases.

The same for 5-2, 2-5 and so on, simplify final fraction.

a) 1/6

b) 1/12

c) 1/9

d) 2/9

3. A group of people has 9 males and 3 females.

Find the probability that the first randomly selected person is female and the second is female again. (you cannot select the same female again).

Use formula for P(A and B), simplify final fraction.

a) 3/22

b) 5/12

c) 1/22

d) 1/8

4. Use definition of factorial K! to calculate 6!/4!

a) 15

b) 30

c) 180

d) 360

5. Use formula for Permutations to calculate in how many ways you can select 2 people out of 10, order of selection makes a difference.

a) 90

b) 60

c) 40

d) 20