Find the variance of the data 9, 5, 6, 6, 9 (treat them as a whole population).
Answer and explanation
Correct answer: C.
- Step 1: Mean .
- Step 2: Variance .
Answer
.
Why not the others: : the sample variance (dividing by ) is calculated. : that is the mean. : it uses the mean of squares without subtracting the squared mean.
Practise more Data Analysis.
Free questions with an explanation for every one, and full timed Junior Cycle (Ireland) mock tests.
More Data Analysis questions
- Find the median of the data 1, 4, 8, 2, 10.
- Find the variance of the data 12, 8, 10, 6, 2, 5, 10, 11 (treat them as a whole population).
- Find the variance of the data 7, 4, 5, 2, 7 (treat them as a whole population).
- Find the variance of the data 6, 7, 6, 10, 11 (treat them as a whole population).
- Find the variance of the data 3, 1, 6, 10, 10, 10, 3, 5 (treat them as a whole population).