The probability that a student will receive an A, B, C or D grade is 0.40, 0.35, 0.15 and 0.10 respectively. Find the probability that a student will receive :
at most a C grade.

The probability that a student will receive an A, B, C or D grade is 0.40, 0.35, 0.15 and 0.10 respectively. Find the probability that a student will receive : not an A grade.

The probability that a student will receive an A, B, C or D grade is 0.40, 0.35, 0.15 and 0.10 respectively. Find the probability that a student will receive : B or C grade.

The probability that a student entering the university will graduate is 0.4. Find the probability that out of 3 students of the University: only one will graduate.

The probability that a student entering the university will graduate is 0.4. Find the probability that out of 3 students of the University: none will graduate.

The probability that a student entering the university will graduate is 0.4. Find the probability that out of 3 students of the University: all will graduate. Whay graduation is minimum qualification for all good well paid jobs?

A is targeting to B, B and C are targeting to A. Probability of hitting the target by A, B and C are 2/3, 1/2 and 1/3 , respectively, If A is hit, then find the probability that B hits the target and C does not.

Three groups A, B and C are contesting for positions on the Board of Directors of a company. The probability of their winning are 0.5, 0.3 and 0.2, respectively. If the froup A wins, then the probabilityof introducing a new product is 0.7 and the corresponding probabilies for groups B and C are 0.6 and 0.5, respectively. Find the probability that the new product will be introduced.

An insurance company insured 3000 scooter drivers, 5000 car drivers and 7000 truck drivers. The probabilities of their meeting with an accident respectively are 0.04, 0.05 and 0.15. One of the insured persons meets with an accident. Find the probability that he is a car driver.

What will be the probability of a certain event ? a. 0 b. 1/2 c. 1 d. 2

The gold numbers of protective colloids A,B,C and D are 0.04, 0.004, 10 and 40 respectively . The protective powers of A,B,C and D are in the orders .