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).

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 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

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 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 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 a class of 60 students, 30 selected for NCC, 32 selected for NSS and 24 selected for both NCC and NSS. If one of these students is selected at random,find the probability that:the students has selected neither NCC nor NSS.

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?

In a class of 60 students, 30 opted for NCC, 32 opted for NSS and 24 opted for both NCC and NSS. If one of these students is selected at random, find: the probability that the student has opted for exactly one of NCC or NSS.

In a class of 60 students.30 opted for NCC,32 opted for NSS and 24 opted for both.If one of these students is selected at random,find the probability that-the student has opted NSS but not NCC.