Students investigated the effect of different concentrations of sucrose solution on the mass of sweet potato cylinders. The table below shows the percentage change in mass of the cylinders after 24 hours.
| Sucrose concentration (0.1 mol dm-3) | Test 1 (%) | Test 2 (%) | Test 3 (%) | Mean percentage change in mass (%) |
|---|---|---|---|---|
| 0.1 | +5.8 | +6.4 | +5.8 | PPP |
| 0.6 | -14.2 | -14.6 | -2.1 | -14.4 |
Calculate the mean percentage change in mass, PPP, for the 0.1 mol dm-3 sucrose solution.