To calculate the mean of a set of marks, follow these steps:

1. Add all the marks together to find the total sum.
2. Count the number of marks in the set.
3. Divide the total sum by the number of marks. This will give you the mean.

For example, if the marks are 75, 82, 90, and 68, the calculation would be:

$\text{Mean} = \frac{75 + 82 + 90 + 68}{4} = \frac{315}{4} = 78.75$

If you have a set of marks, please provide them, and I can calculate the mean for you.

Do you have any specific set of marks for me to calculate? Let me know if you'd like more details on this or have any questions!

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