The image you've uploaded contains handwritten mathematical content in Bengali. It appears to cover various topics such as statistical summations, tabular data, and some formulas, though the specific questions are somewhat obscured by the handwriting.

To assist with the contents:

1. I see a summation notation (Σ), possibly for a mean or variance calculation.
2. There's mention of certain sums related to Σ, such as $\Sigma f_ix_i$ and $\Sigma f_i x_i^2$, likely used in frequency distributions.
3. There are two tables provided:
   • One table has class intervals like 0-14, 14-28, etc., and their corresponding frequencies.
   • Another table has class intervals like 25-35, 35-45, etc., with frequencies as well.

It looks like the document involves statistical methods, possibly related to grouped data, mean, variance, or standard deviation calculations.

Would you like a detailed breakdown of the calculations or any specific part of the document explained? Also, here are some relative questions you may want to explore further:

1. How can I calculate the mean and variance using frequency distributions?
2. What is the formula for calculating the standard deviation in grouped data?
3. Can you explain the difference between discrete and continuous frequency distributions?
4. How does class interval affect the calculation of mean and variance?
5. What is the significance of Σ (summation notation) in statistical formulas?

Tip: When calculating statistics for grouped data, remember that the class midpoint is crucial for estimating the mean accurately.