The teacher tells the students in class that the highest marks obtained by a student in the class is 7 more than twice the lowest marks. if the highest mark is 93 then what is the lowest mark ?

Let A be the set of all 50 students of Class X in a school Let f: A to N be function defined by f(x) = roll number of the student x. Show that f in one-one but not onto.

Suppose A is the set of students in your class who were absent on Tuesday and B the set of students who were absent on Wednesday. Then, A = {Roja, Ramu, Ravi} and B = {Ramu, Preethi, Haneef} Now, we want to find K, the set of students who were absent on either Tuesday or Wednesday. Then, does Roja in Κ? Ramu in Κ? Ravi in Κ? Haneef in Κ? Preeti in Κ? Akhila in Κ?

Form a group with four of five students in your class. Discuss the reasons. Why does farmers rear cattle?

There are 40 students in a class. Their average mark in English is 55. The mean of 10 girl students is 58. Find the mean of the boy students in the class.

Which of the following are sets? The collection of talented boys in a class.

The distribution below gives the weights of 30 students of a class. Find the median weight of the students.