Question 23 — IGCSE 0580 March 2025 Paper 12
Cambridge IGCSE Mathematics 0580, Core tier, non-calculator. Topic: Probability · General. Worth 5 marks.
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Question text
23 Mai buys two batteries.
The probability that a battery is faulty is 1 .
10
First battery Second battery
............ Faulty
Faulty
1
10
Not faulty
............
............ Faulty
............
Not faulty
Not faulty
............
(a) Complete the tree diagram. [2]
(b) Find the probability that Mai buys two faulty batteries.
................................................. [2]
(c) A shop sells 3000 batteries in one month.
W ork out the expected number of faulty batteries the shop sells.
................................................. [1]
(cid:300)(cid:213)(cid:266)(cid:174)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:222)(cid:251)(cid:182)(cid:260)(cid:215)
© UCLES 2025 (cid:300)(cid:200)(cid:239)(cid:241)(cid:209)(cid:289)(cid:296)(cid:268)(cid:236)(cid:254)(cid:266)(cid:253)(cid:289)(cid:288)(cid:237)(cid:194)(cid:292)(cid:258) 0580/12/F/M/25
(cid:293)(cid:261)(cid:213)(cid:213)(cid:245)(cid:277)(cid:197)(cid:181)(cid:181)(cid:213)(cid:229)(cid:197)(cid:197)(cid:245)(cid:293)(cid:277)(cid:181)(cid:213)
M
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
* 0000800000017 *
17
(cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:2)(cid:8)(cid:44)
NIGRAM
Mark scheme
