Q1 · hard · AI-verified
A frequency distribution table shows that 5 students scored 10 marks, 8 students scored 20 marks, 12 students scored 30 marks, and 5 students scored 40 marks. What is the mean score?
- 27
- 25
- 26
- 25.67
Q2 · hard · AI-verified
The mean of five numbers is 30. If each number is multiplied by 4 and then 5 is subtracted from each result, what is the new mean?
- 115
- 120
- 110
- 125
Q3 · hard · AI-verified
A histogram has class intervals 0–10, 10–20, 20–30, 30–40, 40–50 with frequencies 4, 8, 15, 10, 3 respectively. Which class interval contains the median?
- 10–20
- 0–10
- 30–40
- 20–30
Q4 · hard · AI-verified
In a double bar graph, the sales of Product A in January are 450 units and in February are 540 units. The sales of Product B in January are 360 units and in February are 480 units. What is the total percentage increase in combined sales from January to February?
- 30%
- 18%
- 20%
- 25.93% ≈ 26%
Q5 · hard · AI-verified
In a pie chart, the central angles for Sports, Music, Dance, and Art are 90°, 120°, 60°, and 90° respectively, representing 360 students total. How many more students prefer Music over Dance?
- 60
- 40
- 80
- 120