In five subjects of equal marks, S gets 45, 78, 36, 65 and 56 in the first semester and 48, 72, 55, 46 and 79 in the second semester. What are his average marks in the first year?

Correct option is C

Given:

Marks S got in first semester = 45, 78, 36, 65 and 56

Marks S got in second semester = 48, 72, 55, 46, 79

Formula Used:

​$$Average = \frac{Sum\ of\ observations}{Number\ of\ observations}$$​​

Solution:

Total of marks of S in first are =45 + 78 + 36 + 65 + 56 = 280

Average = $$\frac{280}{5} = 56$$​​

Total of marks of S in second semester are = 48 + 72 + 55 + 46 + 79 = 300

Average = $$\frac{300}{5} = 60$$​​

Average of S in first year = $$\frac{56+60}{2} = 58$$​​