The average marks in Science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 instead of the actual marks 72 and 61 respectively, what is the correct average marks of the class?

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**Solution:**

1. Calculate the total marks based on the incorrect average:
   - Total marks = Average × Number of students = $68 	imes 20 = 1360$

2. Find the difference caused by the misread marks:
   - Incorrect sum of the two students' marks = $48 + 65 = 113$
   - Actual sum of the two students' marks = $72 + 61 = 133$
   - Difference = $133 - 113 = 20$

3. Add this difference to the incorrect total to get the correct total marks:
   - Correct total marks = $1360 + 20 = 1380$

4. Calculate the correct average:
   $$	ext{Correct average} = \frac{1380}{20} = 69.5$$

**Answer:** $69.5$

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