CTET 2 Math and Science 07 Jul 2024 Paper

Mean: The mean (average) of a set of numbers is calculated by dividing the sum of all the numbers by the count of numbers.
Range: The range of a set of numbers is the difference between the largest and smallest numbers in the set.
Explanation -
Sum of the marks: $36+37+31+42+23+38+17+18+35+25+29+35=366$
Number of students: 12
Mean $=$ Total Sum $∕$ Number of Students $=366∕12=30.5$
Range:
Maximum marks: 42
Minimum marks: 17
Range $=$ Maximum - Minimum $=42-17=25$
Difference between Mean and Range:
Difference $=$ Mean - Range $=30.5-25=5.5$
Thus, the correct answer is $\underset{‾}{5.5}$.