Probability of the complement of an event

The probability of David passing his driving test is 0.7. What is the probability of David failing the test?

• 0.7

• 0.3

• 0

• 1

In an experiment of rolling a fair dice, A is defined as the event of obtaining a multiple of 3. Find P(A’).

• 1/2

• 1/3

• 2/3

• 1/6

Tags

CCSS.HSS.CP.A.1

A worker at a toll plaza observes that 60% of the cars that pass through the toll plaza are Toyota cars. Find the probability that a car, picked at random among those that pass through the toll plaza, is not a Toyota car.

• 2/5

• 3/5

• 0.2

• 0.6

Tags

CCSS.HSS.CP.A.1

A box contains 3 red, 2 green and 5 white balls which are identical except for their colours. A ball is drawn from the box at random. Find the probability that the ball drawn is not a red ball.

• 1/2

• 3/10

• 2/10

• 7/10

Tags

CCSS.7.SP.C.5

The probability of the school hockey team losing a match to a neighbouring school team is 3/5. The probability of the match ending in a draw is 1/8. Find the probability of the school hockey team winning the match.

• 2/5

• 29/40

• 11/40

• 3/5

Tags

CCSS.HSS.CP.B.7

During a rainy season, the probability of raining on a particular day is 3/5. In a month of 30 days during the season, find the expected number of days without rain.

• 18

• 12

• 15

• 6

Tags

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

CCSS.HSS.MD.B.5

A number is selected at random from set S ={x:51≤x≤100,x is an integer}. Find the probability that the number is not a multiple of 7.

• 1/25

• 2/25

• 7/50

• 43/50

Tags

CCSS.HSS.CP.A.1

A box contains some stamps of which 18 are 60-sen stamps. If a stamp is picked at random from the box, the probability of picking a 60-sen stamp is 2/5. How many stamps in the box are not 60-sen stamps?

• 21

• 25

• 27

• 45

Tags

CCSS.HSS.CP.A.1

CCSS.HSS.CP.B.7

A bag contains 16 red balls, 8 black balls and x white balls. A ball is chosen at random from the bag. The probability of choosing a white ball is 1/3. Find the probability of choosing a ball which is not red.

• 7/9

• 5/9

• 2/3

• 4/9

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSA.REI.A.1

CCSS.HSS.CP.A.1

A bag contains 45 marbles consisting of 17 white marbles and a number of blue and green marbles. A marble is picked at random from the bag. The probability of choosing a blue marble is 2/9. Find the probability of choosing a marble that is not green.

• 2/5

• 3/5

• 17/45

• 28/45

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.8