Measures Of Dispersion Jamb Mathematics Past Questions
Question 1
| Score (x) | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|---|
| Freq (f) | 5 | 7 | 3 | 7 | 11 | 6 | 7 |
- A. 3.42
- B. 4.69
- C. 4.85
- D. 3.72
Question 2
Find the sum of the range and the mode of the set of numbers 10, 9, 10, 9, 8, 7, 7, 10, 8, 10, 8, 4, 6, 9, 10, 9, 10, 9, 7, 10, 6, 5
- A. 16
- B. 14
- C. 12
- D. 10
Question 3
A car dealer bought a second-hand car for N250,000 and spent N70,000 refurbishing it. He then sold the car for N400,000. What is the percentage gain?
- A. 60%
- B. 32%
- C. 25%
- D. 20%
Question 4
The variance of x, 2x, 3x, 4x and 5x is
- A. x√2
- B. \(2x^2\)
- C. \(x^2\)
- D. 3x
Question 5
The range of the data: k+2, k-3, k+4, k-2, k, k-5, k+3, k-1, and k+6 is
- A. 10
- B. 11
- C. 6
- D. 8
