Prediction: Problem Solving & Reasoning
Mathematics
Grade 8
12 questions
~24 mins
1 views0 downloads
About This Worksheet
A worksheet focused on prediction using expected frequency, designed for Grade 8 students to develop procedural skills and reasoning in probability contexts.
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Full preview • 12 questions
Prediction: Problem Solving & Reasoning
Subject: MathematicsGrade: Grade 8
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Date:
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Untitled Worksheet
Grade Grade 8
A
Practice Questions
Answer all questions. Show your working in the grid spaces provided.
1.
Calculate the expected number of students to choose a blue ball from a bag containing 20 balls, of which 5 are blue, if 50 students each pick one ball.
[2 marks]2.
A spinner has 8 equal sections numbered 1 to 8. What is the expected value when spinning once?
[3 marks]3.
In a survey, 60% of people prefer tea over coffee. If 150 people are surveyed, how many are expected to prefer tea?
[2 marks]4.
A die is rolled 120 times. Predict how many times a 6 is expected to appear.
[2 marks]5.
A bag contains 10 red, 15 blue, and 25 green marbles. If a marble is drawn at random, what is the expected number of green marbles in 40 draws?
[3 marks]6.
A factory produces 1000 light bulbs daily, of which 2% are defective. How many defective bulbs are expected per day?
[3 marks]7.
In a game, the probability of winning is 1/4. If a player plays 80 times, how many wins are expected?
[2 marks]8.
A survey shows that 30% of students prefer online classes. If 200 students are surveyed, what is the expected number of students who prefer online classes?
[2 marks]9.
A bag contains 12 red and 8 black balls. Four balls are drawn at random without replacement. Predict how many black balls are expected in the sample?
[3 marks]10.
A candidate has a 75% chance of passing an exam. If 120 students take the exam, how many are expected to pass?
[2 marks]11.
A box contains 5 defective and 95 good items. If 50 items are randomly selected, how many defective items are expected?
[2 marks]12.
A survey finds that 40% of customers prefer brand A. If 250 customers are surveyed, estimate how many prefer brand A.
[2 marks]Quick Actions
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Details
- Created
- 1/1/2026
- Updated
- 1/1/2026
- Type
- worksheet