Practise CAIE IGCSE probability through single and combined events, experimental results, expected frequencies, trees, tables and without-replacement choices.
Elize, Lily and Marco start a business.
Lily buys 20 rolls of ribbon.
8 are red, 6 are blue, 4 are yellow and 2 are pink.
A roll of ribbon is chosen at random.
On the probability scale, draw an arrow ( ↓ ) to show the probability that this roll is
(a) yellow
(b) not red
(c) green.
Kim has a 6-sided spinner numbered 1 to 6 .
She spins it 63 times and her scores are shown in the table.
Find the relative frequency of scoring a 5 with this spinner.
Hemang buys two televisions.
The probability that a television is faulty is 0.02 .
Find the probability that Hemang buys two faulty televisions.
The shop sells 4150 televisions in one year.
Calculate the expected number of faulty televisions.
360 people go on a school trip to one of four places.
Some of the information is shown in the table.
Find the probability that
a girl, picked at random, visits the Wildlife centre,
a person, picked at random from those visiting the Botanic gardens, is a girl,
The probability that it will rain at the wedding is 0.12 .
Find the probability that it will not rain.