Feedback: The correct answer is A. To calculate the mean, add the values for each month and divide by the number of values. As you can see, the large value of 100 cm for month B has impacted the mean value, making it higher than all other observed amounts.
Other climate variables, such as wind, can be similarly affected. To see how the impacts of such errors are reduced, we will examine the relationship between the mean and the climatological record on the next page.