Basic Probability | CIE IGCSE Maths: Extended Paper 4 2023

1

3 marks

cie-igcse-2020-oct-nov-p4-tz2-q6a

The diagram shows six discs.
Each disc has a colour and a number.

One disc is picked at random.

Write down the probability that

i)

the disc has the number 4,

[1]

ii)

the disc is red and has the number 3,

[1]

iii)

the disc is blue and has the number 4.

[1]

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1

3 marks

There are $5$ girls, $6$ boys and some adults in a room.
Jenny selects at random one of these people.

The probability that Jenny selects a girl is $\frac{1}{3}$

Work out the probability that Jenny selects an adult.

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1

1 mark

Tanya plants some seeds.
When a seed produces flowers, the probability that the flowers are red is 0.6 and the probability that the flowers are yellow is 0.3.

Tanya has a seed that produces flowers.

Find the probability that the flowers are not red and not yellow.

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Mass ( $p$ grams)	$0 < p \leq 50$	$50 < p \leq 100$	$100 < p \leq 125$	$125 < p \leq 150$	$150 < p \leq 200$
Frequency	$2$	$5$	$4$	$6$	$3$

Time ( $t$ minutes)	$20 < t \leq 25$	$25 < t \leq 30$	$30 < t \leq 35$	$35 < t \leq 40$	$40 < t \leq 45$
Frequency	$44$	$32$	$28$	$12$	$4$

Time ( $m$ minutes)	$0 < m \leq 10$	$10 < m \leq 40$	$40 < m \leq 60$	$60 < m \leq 90$	$90 < m \leq 100$	$100 < m \leq 120$
Frequency	3	39	43	55	11	9

	Ben	Helen	Paul	Sharif
heads	34	66	80	120
tails	8	12	40	40

CIE IGCSE Maths: Extended

Topic Questions

4.1 Basic Probability

Number	1	2	3	4	5	6
Probability	$2 x$	0.18	$2 x$	$3 x$	0.26	$x$

Number	1	2	3	4
Probability	0.2		0.1

Outcome	Frequency
J	39
K	25
L	16

Number on dice	1	2	3	4	5	6
Probability		0.17	0.18	0.09	0.15	0.1