The marks of 20 students in Physics are given below. 56, 32, 57, 74, 12, 45, 68, 87, 11, 34, 53, 23, 47, 24, 78, 37, 68, 79, 44, 67 a) Find the average marks. b) Divide the class into two groups on the basis of the class performance.
Answers
Given : The marks of 20 students in physics - 56,32,57,74,12,45,68,87,11,34,53,23,47,24,78,37,68,79,44,67
To Find : a. The average marks
b. two groups on the basis of class performance
Solution : a. The average marks
We know, Average marks = The sum of the marks of 20 students/ The number of students
Average marks = 56+32+57+74+12+45+68+87+11+34+53+23+47+24+78+37+68+79+44+67/20
(dividing the sum of marks by the number of students)
Average Marks =996/20
= 49.8
b. Two groups on the basis of performance -
first group - 87,79,78,74,68,68,67,57,56,53 (greater than the average marks ,49.8)
second group - 32,12,45,11,34,23,47,24,37,44(lower than the average mark , 49.8)
Hence, the average mark is 49.8. Two groups are - first group - 87,79,78,74,68,68,67,57,56,53(greater than the average marks)
second group- 32,12,45,11,34,23,47,24,37,44(lower than the average marks).
Answer:
a) 49.8 b)50 (10 student below 50 &10 student above 50