A class 15 students whose ages are 14,17,15,14,21,17,19,20,16,18,20,17,16,19 and 20 years. One student is selected such that each has the same chance of being selected, the age X of the selected student is recorded.
write the probability distribution of X

A class has 15 students whose ages are 14,17,15,14,21,17,19,20,16,18,20,17,16,19 and 20 years. One student is selected such that each has the same chance of being selected, the age X of the selected student is recorded. Find E(X).

A class has 15 students whose ages are 14,17,15,14,21,17,19,20,16,18,20,17,16,19 and 20 years. One student is selected such that each has the same chance of being selected, the age X of the selected student is recorded. Find Var(X).

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability of both being girls?

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability of both being boys?

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability ofone boy and one girl?

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability of atleast one boy?

In class 10 ~A , there are 30 bóys and 20 girls ln 10 ~B , there are 15 boys and 25 girls One student is to be selected from each class i) What is the probability of both being girls? ii) What is the probability of both being boys? iii) What is the probability of one boy and one girl? iv) What is the probability of atleast one boy?

25 girls and 20 boys are studying in standard 10 A .20 girls and 15 boys are in 10 B .One student from each division is to be selected for a competition i) What is the probability of getting both are girls?

There are 30 scouts and 20 guides in a school In another school, there are 20 scouts and 15 guides From each school, one student among them is to be selected for participation in a seminar a) What is the total number of possible selections? b) What is the probability of both being Scouts? c) What is the probability of both being guides? d) What is the probability of one scout and one guide?

In a class, 60% of the students know lesson I, 40% know lesson II and 20% know I and II. A student is selected of random. The probability that the student does not know lesson I and lesson II is