Final answer:
Without specific data on the total count of tomatoes produced by the 15 plants, we cannot calculate the average number of tomatoes per plant. The options provided are potential averages, but we need actual data to determine the correct average.
Step-by-step explanation:
To find the average number of tomatoes per plant, we would need the total number of tomatoes produced by all plants combined, and the number of plants in the study. However, based on the information provided, we do not have the actual data to calculate the average; we only have a list of options for the potential average. In a real-world scenario, the average would be calculated by summing all the tomatoes from each plant and then dividing by the total number of plants, which is n = 15 in this case. Additionally, the mention of the plants growing under the same conditions, being of the same variety, having normal distributions, and other contextual details such as genotype probabilities, mulching conditions' effects on yields, and studying Mendel's characteristics might be relevant for a broader understanding but are not directly useful for calculating the average without the specific data of tomato counts per plant.