Final answer:
The question requires additional information such as the mean and standard deviation of the sales figures which are essential to calculate the probability of the average sales being less than $24,000.
Step-by-step explanation:
The question pertains to the field of probability and statistics, specifically to the calculation of the probability concerning the average sales of a group. To answer the question about the probability that the average sales for a group of 25 salespersons will be less than $24,000 this month, one would need more information, such as the mean and standard deviation of the sales figures for the salespersons. If that data were available, the problem could be approached using the Central Limit Theorem which allows us to find the probability of certain averages occurring within a data set. With the appropriate statistical measures, we would standardize the average using a z-score and then look up the corresponding probability in a standard normal distribution table.