Let's go through the questions based on the provided image:

1. What is class-interval for classes 31 – 35?

   • The class interval for this group is the difference between the upper limit and lower limit.
   • Class interval = 35 (upper limit) - 31 (lower limit) = 4.

2. How many students are there in the range of 41 – 45 kgs?

   • From the frequency table, the number of students in the 41 – 45 kg range is 14.

Would you like more details on any part of this solution?

Here are 5 related questions for you to explore:

1. What is the total frequency for all weight groups in the table?
2. How would you calculate the mean weight using the frequency distribution table?
3. What is the range of the weights in this data set?
4. How would you calculate the cumulative frequency for each class?
5. How can you estimate the mode using this frequency distribution?

Tip: To calculate the mean from a frequency distribution, multiply each class midpoint by the frequency, then divide the total by the sum of the frequencies.