Question
Question 6 (ii)
A teacher wanted to analyze the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few Students got under 20 marks and a few got 70 marks or above.So she decided to Group them into intervals of varying sizes as follows : 0−20,20−30…60−70,70 − 100. Then she formed the following table:
MarksNumber of student0−20720−301030−401040−502050−602060−701570−above8Total90
(ii) Find the probability that a student obtained marks 60 or above.