75.
Problem
5 students get less than 3 marks
12 students get less than 6 marks
25 students get less than 9 marks
33 students get less than 12 marks
The number of students who got 6 to 12 marks in the above problem will be

79.
The shape of standard normal variate depends upon
1. mean
2. standard deviation
3. quartile deviation
4. mean deviation
Select the correct answer using the options given below