Statisticshard · Past Paper
If the sum of squares of 10 observations is 250 and their mean is 4, find the variance.
A9
B25
C5
D10
✓ Correct Answer: A — 9
Variance = (Σx^2 / N) - (Mean)^2 = (250 / 10) - (4)^2 = 25 - 16 = 9.
Share this question
More from Statistics
- In a pie chart, if a component represents 20% of the total data, what is its central angle?
- A bag contains 5 red, 4 green, and 3 blue marbles. What is the probability of drawing a marble that is not red?
- What is the mode of a continuous series? It is the value in the class with the:
- A committee of 3 is to be formed from 5 men and 2 women. What is the probability that the committee contains at least one woman?
- Calculate the mean of 2.5, 3.5, 4.5, 5.5.