Yr 10 Probability Revision

What is the probability of rolling a number less than 1 on a regular 6-sided die?

• 0

• 1

• 1/2

• 6

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A regular 6-sided die is rolled 48 times. How many times would you expect to roll a 2?

• 96

• 24

• 2

• 8

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A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6
• 1/2
• 1/3
• 1/6

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P(not A) = 
*Remember to simplify.*

• 6/8
• 3/4
• 2/8
• 1/4

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Describe the likelihood of an event with the probability of 1.

• certain to happen

• impossible to happen

• unlikely to happen

• equally likely as not to happen

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Describe the likelihood of an event happening that has the probability of one-half.

• certain to happen

• impossible to happen

• equally likely as not to happen

• likely to happen

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A spinner is spun and then a fair coin is tossed. The experiment was repeated a number of times. Below are the results.

red, heads = 4 times

red, tails = 3 times

blue, heads = 5 times

blue, tails = 3 times

What is the probability the result will be red, tails the next time the experiment is repeated?

• one-fifth

• three-tenths

• two-fifteens

• one-third

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Two dice are rolled and it is recorded whether the result on each is odd or even. What is the probability that one is even and one is odd?

• 1/2

• 1/4

• 3/4

• 1/3

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A box contains 3 brand A batteries and 7 brand B batteries. 30% of brand A batteries are faulty and 40% of brand B batteries are faulty. A battery is selected at random and then checked to see if it is faulty. What is the probability that a not faulty brand A battery is selected?

• 0.21

• 0.09

• 0.28

• 0.25

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In a box are 3 red pens, 4 black pens and 2 green pens. You pick a pen at random and then put it back. Your friend then picks a pen. What is the probability you both pick the same clour?

• 29/81

• 9/81

• 3/9

• 2/9

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