Home / CIE iGCSE Maths C8.1 Introduction to probability Exam Style Practice Questions- Paper 3

CIE iGCSE Maths C8.1 Introduction to probability Exam Style Practice Questions- Paper 3

CIE iGCSE Maths C8.1 Introduction to probability Exam Style Practice Questions- Paper 3

Question

360 people go on a school trip to one of four places.
Some of the information is shown in the table.

 Adventure parkBotanic gardensWildlife centreRed castleTotal
Boys6512 36 
Girls 962 163
Staff153  37
Total1442412171360

(a) Complete the table. 

(b) Find the probability that

(i) a girl, picked at random, visits the Wildlife centre,
(ii) a person, picked at random from those visiting the Botanic gardens, is a girl, 
(iii) a person, picked at random, visits the Adventure park or the Botanic gardens. 

(c) The people who visit the Adventure park travel by coach. Each coach has 52 seats for passengers.

Complete this statement.

The least number of coaches needed for the trip to the Adventure park is …… and there will be a total of …… empty seats. 

(d) The school hires one coach from each of two different companies for the trip to Red castle.

A coach from Fast Track coaches costs $600 plus $0.72 per kilometre travelled.
The total cost, in dollars, for travelling x kilometres is \( 600 + 0.72x \).

(i) A coach from Rapid coaches costs $550 plus $1.12 per kilometre travelled.

Write an expression for the total cost, in dollars, for travelling x kilometres. 

(ii) Both companies charge the same amount for the trip.

Write down an equation and solve it to find the distance travelled.

(e) The length, \( l \) km, of the journey to the Wildlife centre is 53 km, correct to the nearest kilometre.

Complete this statement about the value of \( l \): $……  \leq l <  ……$

(f) Samira takes $31.50 to spend in the Botanic gardens.

(i) She spends \( \frac{2}{7} \) of this money on food.

Work out how much Samira spends on food.

(ii) At the end of the visit to the Botanic gardens, Samira has $4.50 left.

What fraction of her money does Samira spend?

Give your answer in its simplest form.

▶️ Answer/Explanation
Solution

(a) Completed table: 

Boys Wildlife centre: 47, Boys Total: 160

Girls Adventure park: 64, Girls Red castle: 28

Staff Wildlife centre: 12, Staff Red castle: 7

(b)(i) \( \frac{62}{163} \)

There are 62 girls at Wildlife centre out of 163 total girls.

(b)(ii) \( \frac{3}{8} \)

At Botanic gardens, 9 girls out of 24 total people gives simplified probability.

(b)(iii) \( \frac{7}{15} \)

Adventure park (144) + Botanic gardens (24) = 168 out of 360 total people.

(c) 3 coaches, 12 empty seats

144 people ÷ 52 seats = 2.77 → 3 coaches needed. 3×52=156 seats, 156-144=12 empty.

(d)(i) \( 550 + 1.12x \)

This is the cost structure for Rapid coaches.

(d)(ii) 125 km

Set equations equal: \( 600 + 0.72x = 550 + 1.12x \). Solve to get x=125.

(e) 52.5 ≤ l < 53.5

53 km to nearest km means between 52.5 and 53.5 km.

(f)(i) $9

\( \frac{2}{7} \times 31.50 = 9 \).

(f)(ii) \( \frac{6}{7} \)

Amount spent = 31.50 – 4.50 = 27. Fraction spent = 27/31.5 = 6/7 simplified.

Question

(a) Jian has a fair spinner in the shape of a regular hexagon. The spinner is numbered 2, 2, 3, 4, 4, 5.

Hexagonal spinner

Jian spins the spinner. Find the probability that the spinner lands on

(i) an even number,

(ii) a number less than 6,

(iii) the number 1

(b) Mei has two fair square spinners, A and B. Spinner A is numbered 1, 2, 2, 4 and spinner B is numbered 3, 3, 4, 5.

Two square spinners

She spins both spinners and adds the two numbers.

(i) Complete the table to show all the possible outcomes.

Probability table

(ii) Use the table to write down the probability that the total is

(a) 5,

(b) more than 5.

(c) Ning has a spinner numbered 1 to 6. She spins it 50 times and her results are shown in the table.

Spinner results table

(i) Write down the mode.

(ii) Find the median.

(iii) Work out the mean.

▶️ Answer/Explanation
Answers:

(a)(i) 2/3 – 4 even numbers (2,2,4,4) out of 6 total.

(ii) 1 – All numbers (2,2,3,4,4,5) are less than 6.

(iii) 0 – Number 1 doesn’t exist on the spinner.

(b)(i) Table completion: 5,6 in top row; 8,9 in bottom row.

(ii)(a) 5/16 – 5 combinations (1+4, 2+3, 2+3, 2+3, 2+3) sum to 5.

(b) 9/16 – 9 sums (6,8,9) exceed 5 in the 4×4 table.

(c)(i) 1 – Appears most frequently (18 times).

(ii) 2 – Middle value when data is ordered.

(iii) 2.76 – (1×18 + 2×12 + … + 6×3) ÷ 50.

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