The probabilities that a student will receive A,B,C and D grade are 0.4,0.35,0.15 and 0.1 respectively.Find the probability that a student will receive Atmost C grade.

The probabilities that a student will receive A,B,C and D grade are 0.4,0.35,0.15 and 0.1 respectively.Find the probability that a student will receive B or C grade.

The probabilities that a student will receive A,B,C and D grade are 0.4,0.35,0.15 and 0.1 respectively.Find the probability that a student will receive not an A grade.

An anti-aircraft gun can take a maximum of four shots at any plane moving away from it. The probabilities of hitting the plane at the 1 st, 2 nd, 3 rd and 4 th shots are 0.4, 0.3, 0.2 and 0.1 respectively. What is the probability that at least one shot hits the plane ?a)0.6976 b)0.3024 c)0.72 d)0.6431

Probability that a problem will be solved by three students are 1/4,1/2,3/4 respectively.what is the probability that the problem will be solved

Probability that a problem will be solved by three students are 1/4,1/2,3/4 respectively.what is the probability that all solves the problem.

Probability that a problem will be solved by three students are 1/4,1/2,3/4 respectively.what is the probability that none solves the problem

Probability that a problem will be solved by three students are 1/4,1/2,3/4 respectively.what is the probability that (iv).Exactly one solves the problem

A problem is given to three students whose chances of solving it are 1/2,1/3 and 1/4 respectively.What is the probability that: None solve the problem.