The marks of 5 students are 25, 35, 45, 50, 15. Calculate the average marks.

Correct option is B

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Given:
Marks of 5 students are 25, 35, 45, 50, 15.
Formula Used:
Average $$= \frac{\text{Sum of values}}{\text{Number of values}} \\[10pt]$$ 
Solution:
​$$\text{Average} = \frac{25 + 35 + 45 + 50 + 15}{5} \\\Rightarrow \text{Average} = \frac{170}{5} \\\Rightarrow \text{Average} = 34$$​​