Correct option is C
Solution:
First, we will write the marks of all the students in co-ordinate form, with MSc marks as x co-ordinate and PhD marks as y co-ordinate, then we will have the following data of students:
(40,30), (40,40), (40,50), (50,30),
(50,40), (60,50), (70,50), (80,50),
(70,70), (90,70)
From the above data it is clear that, the option stating about two students scoring the same marks in their Pre-Ph.D. and M.Sc. exam is correct and all other options are incorrect.
∴ Two students scored the same marks in their Pre‐Ph.D. and M.Sc. exams is the correct option.
