Suppose a class has 7 students. The average marks of these students in the mathematics examination is 62, and their variance is 20. A student fails in the examination if he/she gets less than 50 marks, then in worst case, the number of students can fail is ______.
← JEE Main 2022 · 28 Jun · Shift 2
MathematicsInteger+4 / -1Question 22 of 90
JEE Main 2022 · 28 Jun · Shift 2, Mathematics question 22
Answer and worked solution
Official answer: 0
Total squared deviation . A failing student is more than 12 below the mean, contributing over alone.
So no student can fail.
Answer: 0