Probability Basics

A ball is picked at random from a bag containing 5 red, 1 blue, 4 green and 2 yellow balls. What is the probability of selecting a red ball ?

• 1/2
• 2/3
• 4/5
• 5/12

A bal lis picked at random from a bag containing 5 red, 1 blue, 4 green and 2 yellow balls. What is the probability of selecting a blue or green ball ?

• 5/12
• 1/3
• 2/7
• 1/2

The probability of picking a red counter is 0.35. Find P(not red).

• 0.55
• 0.7
• 0.65
• 0.6

A spinner has 3 sectors. If P(sector A) = 0.05 and P(sector B) = 0.64, find P(sector C).

• 0.35
• 0.31
• 0.36
• 0.3

A bag contains some red and 15 blue counters. If P(red) = 4/7 , how many counters are in the bag?

• 35
• 19
• 38
• 65

A fair dice is rolled 120 times. How many times would you expect to get a prime number ?

• 80
• 50
• 60
• 40

The probability of Jack not winning a game is 0.35. If jack plays the game 80 times, how many games would you expect him to win?

• 28
• 52
• 18
• 40

What is the probability of picking a red 10 from a pack of cards?

• 2/52

• 2

• 1/52

• 4/52

In a bag of lollies I have 4 red, 8 purple and 3 blue lollies. What is the probability of picking a red or blue lolly?

• 7/15

• 4/15

• 3/15

• 7

What is the probability of winning more than $100 on this wheel?

• 2/8

• 3/8

• 2

• 3