The mass of 80 parcels is summarised below.
| Mass (nearest kg) | Frequency |
|---|---|
| 40 - 49 | 5 |
| 50 - 59 | 12 |
| 60 - 69 | 30 |
| 70 - 79 | 21 |
| 80 - 89 | 9 |
| 90 - 99 | 3 |
Using the class midpoints, you may use: ∑fx=5420\sum fx = 5420∑fx=5420 and ∑fx2=377960\sum fx^2 = 377960∑fx2=377960
Use linear interpolation to estimate the median mass.
Estimate the mean mass.
Estimate the standard deviation.
32 exam-style questions on Edexcel AS Level Maths Measures of Location and Spread, covering 2.1 Measures of Central Tendency, 2.2 Other Measures of Location, 2.3 Measures of Spread, 2.4 Variance and Standard Deviation, and 2.5 Coding. Each one has a worked solution and a mark scheme showing where the marks go.