Given: Vibha’s marks in Maths = 74 Vibha’s marks in Chemistry = 66 Vibha’s marks in Hindi = 92 Vibha’s marks in English = 78 Vibha’s marks in Physics = 55 Calculations: ∴ Required Average =(74+66+92+78+55)/5 ⇒365/5 ⇒ 73 The average marks of Vibha is 73.