Q.1 The average marks obtained by Saloni in four papers is 51, and in the fifth paper she
gets 56 marks. Find her new average in all five papers.
सलोनी द्वारा चार पेपरों में प्राप्त औसत अंक 51 है, और पांचवें पेपर में उसे 56 अंक प्राप्त हुए हैं। सभी पाँच पेपरों में उसका नया औसत ज्ञात की जिए।
Ans
1. 51 2. 50 3. 49 4. 52
Sol . (d)
Method (1)
Average in 4 subject = 51
Total marks in 4 subject = 51 * 4 = 204
After 5th subject, Total marks of saloni in 5 subjects = 204 + 56 = 260
New average (5 subject) = 260/5 = 52
Method (2)
Total deviation = 56 – 51 = +5
Average increased in 5 subject = +5/5 = 1
New average = 51 + 1 = 52