Conditional probability Quiz
10 questions · easy to harder · Probability · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 0 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
Boys 12 cat 8 dog, girls 10 cat 20 dog, P(dog given girl)Type the answer.
2 Question 2
Boys 5 yes 15 no, girls 10 yes 10 no, P(yes given girl)Type the answer.
3 Question 3
Adults 30 tea 10 coffee, children 5 tea 15 coffee, P(coffee given adult)Type the answer.
4 Question 4
Men 16 yes 4 no, women 12 yes 8 no, P(yes given man)Type the answer.
5 Question 5
Adults 30 tea 10 coffee, children 5 tea 15 coffee, P(adult given tea)Type the answer.
6 Question 6
Juniors 8 bus 12 car, seniors 6 bus 14 car, P(senior given car)Type the answer.
7 Question 7
A bag has 4 red and 2 blue marbles, two are picked without replacement, P(second blue given first red)Type the answer.
8 Question 8
A bag has 5 red and 3 blue marbles, two are picked without replacement, P(second blue given first blue)Type the answer.
9 Question 9
Men 24 yes 16 no, women 18 yes 22 no, P(man given yes)Type the answer.
10 Question 10
Boys 15 bike 25 walk, girls 20 bike 20 walk, P(girl given bike)Type the answer.