If the average marks of two batches of 55 and 45 students respectively is 50 and 60, then the average marks of all the students is:a.54.5b.55c.56.8d.53
Question
If the average marks of two batches of 55 and 45 students respectively is 50 and 60, then the average marks of all the students is:a.54.5b.55c.56.8d.53
Solution
To find the average marks of all the students, you need to find the total marks of all students and then divide by the total number of students.
Step 1: Find the total marks for each batch. For the first batch of 55 students with an average mark of 50, the total marks would be 55 * 50 = 2750. For the second batch of 45 students with an average mark of 60, the total marks would be 45 * 60 = 2700.
Step 2: Add the total marks of both batches together. 2750 + 2700 = 5450
Step 3: Add the total number of students together. 55 + 45 = 100
Step 4: Divide the total marks by the total number of students to find the overall average. 5450 / 100 = 54.5
So, the average marks of all the students is 54.5 (option a).
Similar Questions
The average marks of 50 students in a class was found to be 64 . If the marks of two students were incorrectly entered as 38 and 42 instead of 83 and 24 , respectively, then what is the correct average?
The average mark obtained by 40 students is 56. If the average marks of 8 students who failed the examination are 10, what are the average marks of students who passed the examination?
Marks obtained by 65 students are given below. Find median.
The mean and S.D. of marks of 70 students were found to be 65 and 5.2 respectively. Laterit was detected that the marks of one student was wrongly recorded as 85 instead of 58.Obtain the correct s.d
In an examination the average marks obtained by John in English, Maths, Hindi and Drawing were 50. His average marks in Maths, Science, Social Studies and Craft were 70. If the average marks in all seven subjects is 58, his score in maths was?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.