**Mean Marks in Statistics**

The mean marks in statistics for the 450 students can be calculated by summing up all the individual marks and dividing it by the total number of students. In this case, the mean marks in statistics is given to be 40.

**Mean Marks in Economics**

Similarly, the mean marks in economics for the 450 students can be calculated by summing up all the individual marks in economics and dividing it by the total number of students. In this case, the mean marks in economics is given to be 48.

**Calculating the Total Marks**

To calculate the total marks in statistics, we need to multiply the mean marks by the total number of students. Therefore, the total marks in statistics can be calculated as follows:

Total Marks in Statistics = Mean Marks in Statistics * Total Number of Students
Total Marks in Statistics = 40 * 450
Total Marks in Statistics = 18000

Similarly, the total marks in economics can be calculated as follows:

Total Marks in Economics = Mean Marks in Economics * Total Number of Students
Total Marks in Economics = 48 * 450
Total Marks in Economics = 21600

**Explanation**

From the calculations above, we can see that the total marks in economics (21600) is higher than the total marks in statistics (18000). This indicates that, on average, the students performed better in economics compared to statistics.

The difference in mean marks between the two subjects suggests that economics may be a subject where students generally perform better or find it easier compared to statistics.

It is important to note that these calculations are based on the assumption that the mean marks accurately represent the overall performance of the students in each subject. However, other factors such as the difficulty level of the exams, individual student abilities, and study habits can also influence the results.

Overall, this analysis provides an understanding of the mean marks in statistics and economics for the given group of 450 students, and how they compare to each other.