Statistics - JSS1 Mathematics Past Questions and Answers - page 2
If a survey collects data from 1000 people and 750 of them prefer option A, what percentage of people prefer option A?
Percentage of people who prefer option A
= (Number of people who prefer option A / Total number of people) × 100 Percentage
=(750/1000)×100
=75%
A company produces 5000 units of a product per month. If 300 units are found defective, what is the percentage of defective units?
Percentage of defective units
= (Number of defective units / Total number of units produced) × 100 Percentage
=(300/5000)×100
=6%
In a class of 30 students, the average score in a test is 80. If 5 additional students join the class and their average score is 85, what is the new average score for the entire class?
First, find the total score for the initial 30 students: Total score for 30 students=30×80=2400
Next, find the total score for the 5 additional students: Total score for 5 students=5×85=425
Combine the total scores: Combined total score=2400+425=2825
Find the new average score for the entire class of 35 students: New average score=2825/35=80.71≈81
A factory produces 5000 widgets per day. If 10% of the widgets fail quality control, how many widgets pass the quality check daily?
First, find the number of widgets that fail quality control: Number of defective widgets=5000×(10/100)=500
Subtract the number of defective widgets from the total number of widgets produced: Number of widgets that pass quality control=5000−500=4500