Probability Practice Test: answer key

Every answer, with a link to its step-by-step solution

#	Answer	Lesson	Solution
1	outfits = 6	Counting choices	Solved step by step
2	PINs = 5040	Counting choices	Solved step by step
3	C ways = 24	Factorials	Solved step by step
4	ways = 5040	Factorials	Solved step by step
5	D 20	Permutations	Solved step by step
6	210	Permutations	Solved step by step
7	B 10	Combinations	Solved step by step
8	35	Combinations	Solved step by step
9	C P(4) = 16	Probability	Solved step by step
10	P(not multiple of 5) = 45	Probability	Solved step by step
11	D P(a) = 38	Odds	Solved step by step
12	P(win) = 14	Odds	Solved step by step
13	D 56%	Experimental probability	Solved step by step
14	0%	Experimental probability	Solved step by step
15	A P(2 heads) = 14	Sample spaces	Solved step by step
16	P(sum more than 3) = 1112	Sample spaces	Solved step by step
17	A P(all red) = 215	Probability with counting	Solved step by step
18	P(all kings) ≈ 0.000181	Probability with counting	Solved step by step
19	P(A or B) = 13	Probability with or	Solved step by step
20	P(A or B) = 713	Probability with or	Solved step by step
21	P(heads and 6) = 112	Probability with and	Solved step by step
22	P(both black) = 29	Probability with and	Solved step by step
23	P(dog) = 1425	Two-way tables	Solved step by step
24	P(woman or right) = 35	Two-way tables	Solved step by step
25	P(dog \| girl) = 23	Conditional probability	Solved step by step
26	P(girl \| bike) = 47	Conditional probability	Solved step by step
27	A P(both) = 15	Venn and tree diagrams	Solved step by step
28	P(sun \| walk) = 0.8	Venn and tree diagrams	Solved step by step
29	A E = $0.40	Expected value	Solved step by step
30	E = $0.25	Expected value	Solved step by step
31	B P(1 head) = 38	Binomial probability	Solved step by step
32	P(1 one) ≈ 0.4019	Binomial probability	Solved step by step

Grade

Count your right answers and divide by the number of questions: A 90% or more, B 80%, C 70%, D 60%, F below 60%.