Neco 2017 Geography Question 20

The following table gives the average monthly temperature (°C) and total rainfall (mm) recorded at City Z over a calendar year.\n\n| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |\n|-------|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|\n| Temp (°C) | 28 | 30 | 32 | 33 | 31 | 29 | 27 | 26 | 27 | 28 | 29 | 28 |\n| Rainfall (mm) | 120 | 110 | 80 | 40 | 20 | 10 | 5 | 8 | 30 | 70 | 100 | 130 |\n\na) Compute the coefficient of variation (CV) of the temperature series, expressed as a percentage to one decimal place. Use the population standard deviation.\nb) Determine the month in which the ratio of rainfall to temperature is highest. Give the month name.\nc) Based on the data, state whether the relationship between temperature and rainfall for the year is positively correlated, negatively correlated, or shows no clear correlation. (No calculation of the correlation coefficient is required; justify briefly.)