Directions: The number of students in Class XI in the Science, Arts, and Commerce streams of a school over 4 years (2011 - 2014) has been depicted through the bar chart given below.
What is the difference between the average number of Science and Commerce students in the given class over the given period of 4 years?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 5.
Average = Sum of observations/Number of observations
Total number of Science students = 20 + 30 + 40 + 10 = 100
Average of Science students = 100/4 = 25
Total number of Commerce students = 40 + 30 + 20 + 30 = 120
Average of commerce students = 120/4 = 30
Required difference = 30 - 25 = 5