Probability with counting 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.
- 5 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
A bag has 4 red and 6 blue marbles, 2 are picked at random, P(both red)- A) P(all red) = 215
- B) P(all red) = 45
- C) P(all red) = 6
2 Question 2
A team has 4 seniors and 6 juniors, 2 are picked at random, P(both seniors)Type the answer.
3 Question 3
A club of 10 picks a president and a vice president at random, P(Ann is president and Ben is vice president)- A) P(Ann president, Ben vice) = 1
- B) P(Ann president, Ben vice) = 190
- C) P(Ann president, Ben vice) = 90
4 Question 4
2 cards are dealt from 52, P(both aces)Type the answer.
5 Question 5
A bag has 5 red and 4 blue marbles, 3 are picked at random, P(all red)- A) P(all red) = 10
- B) P(all red) = 84
- C) P(all red) = 542
6 Question 6
A class has 7 boys and 5 girls, 2 are picked at random, P(1 boy and 1 girl)Type the answer.
7 Question 7
2 cards are dealt from 52, P(both hearts)- A) P(all hearts) = 117
- B) P(all hearts) = 78
- C) P(all hearts) = 1326
8 Question 8
A club of 8 picks a president and a vice president at random, P(Ann is president)Type the answer.
9 Question 9
A bag has 5 red and 3 blue marbles, 3 are picked at random, P(exactly 2 red)- A) P(2 red, 1 blue) = 1528
- B) P(2 red, 1 blue) = 3
- C) P(2 red, 1 blue) = 10
- D) P(2 red, 1 blue) = 56
10 Question 10
3 cards are dealt from 52, P(all kings)Type the answer.