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 .
Complete the tree diagram.
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,
a person, picked at random, visits the Adventure park or the Botanic gardens.