Neco 2022 Geography Question 4

The following monthly climate data are recorded at a weather station:\n\nRainfall (mm): Jan 120, Feb 80, Mar 100, Apr 150, May 200, Jun 250, Jul 300, Aug 280, Sep 220, Oct 180, Nov 130, Dec 110.\nTemperature (°C): Jan 28, Feb 27, Mar 26, Apr 25, May 24, Jun 23, Jul 22, Aug 22, Sep 24, Oct 25, Nov 26, Dec 27.\n\n(a) Compute the coefficient of variation (CV) for the rainfall series (expressed as a percentage, one decimal place).\n(b) Identify the month with the greatest positive temperature anomaly relative to the annual mean temperature.\n(c) If the rainfall in the wettest month is reduced by 10 % because of climate change, what is the new annual total rainfall (in mm)?