LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
28 views
in Aptitude by (30.0k points)
closed by
If the average marks of three batches of 50, 60 and 70 students respectively is 65, 50 and 80, then the average marks of all the students is:
1. 66
2. 55 
3. 62 
4. 60 

1 Answer

0 votes
by (53.7k points)
selected by
 
Best answer
Correct Answer - Option 1 : 66

Given 

Three batches of student = 50, 60, 70 

The average marks of three batches = 65, 50, 80,

Formula Used 

Average = sum of data/No. of data

Calculation 

Sum of marks of 50 student = 50 × 65 = 3250

Sum of marks of 60 student = 60 × 50 = 3000

Sum of marks of 70 student = 70 × 80 = 5600

 Average marks of all students  = Sum of markets obtained by all students/Total number of students

⇒ (3250 + 3000 + 5600)/(50 + 60 + 70)

⇒ 11850/180 = 65.83  = 66(approx.)

∴ The average marks of all students is 66.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...