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Complementary Probability

Objective: I know how to find the complementary probability of an event.

If the probability of an event, A, is P(A), then the probability that the event would not occur is 1 – P(A)

Read the lesson on complementary probability for more information and examples.

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Work out the following.
When necessary, give your answer in fractions eg. 2/5

1. A set of cards with a letter on each card as shown below are placed into a bag. Howard picks a card at random from the bag.

Determine the probability that the card is:
a) an E.

b) not an E.

c) not a vowel.

d) a P.

e) not a P.

f) either a Q or U or H

g) not a Q, U or H.

2. A number is chosen at random from a set of whole numbers from 1 to 50. Calculate the probability that the chosen number:
a) is not a perfect square

b) is not a multiple of 4

c) is more than 45

d) is not more than 45

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