Mean Calculation for Marks Obtained:

To calculate the mean using the given data, we need to follow these steps:

1. Assign values to the data:
We have the following data for marks obtained: below 10, below 20, below 30, below 40, below 50, below 60.
And, we have the corresponding number of students for each mark range: 6, 15, 29, 41, 60, 70.

2. Calculate the midpoints:
To find the midpoint for each range, we can assume that the marks obtained are the upper limits for each range.
So, the midpoints for each range would be: 10, 20, 30, 40, 50, 60.

3. Calculate the product of midpoints and frequencies:
Multiply each midpoint with its corresponding frequency.
For example, for the first range (below 10), the midpoint is 10 and the frequency is 6. So, the product would be 10 * 6 = 60.
Similarly, calculate the products for all the ranges.

4. Sum up the products:
Add up all the products obtained in the previous step.
For example, if we have the products as 60, 300, 870, 1640, 3000, 4200, then the sum would be 60 + 300 + 870 + 1640 + 3000 + 4200 = 10,070.

5. Sum up the frequencies:
Add up all the frequencies given in the data.
For example, if we have the frequencies as 6, 15, 29, 41, 60, 70, then the sum would be 6 + 15 + 29 + 41 + 60 + 70 = 221.

6. Calculate the mean:
Divide the sum of the products (step 4) by the sum of the frequencies (step 5).
In our example, the mean would be 10,070 / 221 ≈ 45.49.

Answer:
The mean of the given data for marks obtained is approximately 45.49.

Answer is 35