Questions covered in Basic

Review the question prompts below before starting the timed test. Try each problem independently, then use the interactive test to record your answers and review the worked solutions.

1. The range of the data 2, 7, 6, 4, 3, 8, 5, 12 is
2. If each observation of a data is increased by 5, then their variance
3. The mean of the first $n$ natural numbers is
4. If the standard deviation of a data is 4, then the variance is
5. Which of the following is a measure of dispersion?
6. Find the mean of the first 5 multiples of 7.
7. Find the mean deviation about the median for the data: 3, 9, 5, 3, 12, 10, 18, 4, 7, 19, 21.
8. Write the formula for the coefficient of variation.
9. Find the variance of the data: 2, 4, 6, 8, 10.
10. Find the mean deviation about the mean for the data: 6, 7, 10, 12, 13, 4, 8, 12.
11. Calculate the mean and standard deviation for the following distribution:
    Class: 0-10, 10-20, 20-30, 30-40, 40-50
    Frequency: 5, 8, 15, 16, 6
12. Case Study: Two batsmen A and B scored the following runs in 5 innings:
    A: 30, 40, 50, 60, 70
    B: 10, 20, 50, 80, 90
    (i) Find the mean score of Batsman A.
    (ii) Find the mean score of Batsman B.
    (iii) Which batsman is more consistent?