NumericalModerate1.5 marks
8(ii)
For the given frequency distribution, find the:
mean, to the nearest whole number
Topic: Mean / median / mode / quartiles
Previous-year question practice database
Answer
Exam answer
| x | f | fx |
|---|---|---|
| 10 | 3 | 30 |
| 11 | 2 | 22 |
| 12 | 2 | 24 |
| 13 | 6 | 78 |
| 14 | 3 | 42 |
| 15 | 5 | 75 |
| 16 | 3 | 48 |
| Total | Σf = 24 | Σfx = 319 |
Mean = Σfx/Σf = 319/24 = 13.2916...
To the nearest whole number:
Answer: 13.
Explanation
Multiply each observation x by its frequency f, add the products, and divide by the total frequency.
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 observations2025median2025the total number of workers.2025the median class.2025