An investigator analyzed the relative reactivity of different metals by measuring the temperature increase when equal masses of each metal were added to a fixed volume of copper(II) sulfate solution.
The student's recorded data is shown in the table below:
| Metal | Temperature rise in ∘C^\circ\text{C}∘C (Trial 1) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 2) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 3) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 4) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 5) | Mean temperature rise in ∘C^\circ\text{C}∘C |
|---|---|---|---|---|---|---|
| Tin | 2.1 | 1.9 | 2.4 | 1.8 | 1.8 | 2.0 |
| Zinc | 14.2 | 13.8 | 14.5 | 13.9 | 13.6 | 14.0 |
| Magnesium | 24.5 | 25.1 | 8.2 | 24.8 | 25.6 | XXX |
Calculate the mean temperature rise X X\,X for magnesium in the table.
Do not include the anomalous result in your calculation.