GraphModerate1 mark
10(b)
The histogram below represents the scores obtained by 25 students in a mathematics mental test. Use the data to :
To calculate mean
Topic: Histogram / ogive / statistical graph
Previous-year question practice database
Answer
Solution diagram
Exam answer
| Marks | f | Class mark x | fx |
|---|---|---|---|
| 0–10 | 2 | 5 | 10 |
| 10–20 | 5 | 15 | 75 |
| 20–30 | 8 | 25 | 200 |
| 30–40 | 4 | 35 | 140 |
| 40–50 | 6 | 45 | 270 |
| Total | Σf = 25 | Σfx = 695 |
Mean = Σfx/Σf = 695/25 = 27.8.
Answer: Mean = 27.8 marks.
Explanation
Use class marks 5, 15, 25, 35 and 45 and calculate Σfx/Σf.
More from Measure of Central Tendency (Mean, Median, Quartiles and Mode)
Rakhi’s mobile number has the following integers :
1, 6, 9, 8, 9, 1, 7, 8, 9
The mode of the above given data is :2026Find the mean of the following frequency distribution using step-deviation method.
Take assumed mean = 282026Assertion (A): The mean of first 9 natural numbers is 4.5.
Statement 2: Mean = Sum of all observations / Total number of observations2025mean, to the nearest whole number2025median2025the total number of workers.2025