There are 30 scouts and 20 guides in a school. In another there are 20 scouts and 15 guides.From each school one student among them is to be selected for participation in a seminar.
What is the probability of one scout and one guide?

A committee of two persons is selected from two men and two women. What is the probability that the committee will have : One man?

One number is selected from the first 50 natural numbers. What is the probability that it is a root of x+(256)/(x)gt40 ?

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 in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded. What is the probability distribution of the random variable X? Find mean, variance and standard deviation of X.

Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel) . Previous years results report that 30% of all students who reside in hostel attain A grade and 20% of day scholrs attain A grade in their annual examination . At the end of the year, one student is chosen at random from the college and he has an A grade, what is the probability that the student is a hostler ?

A committee of two persons is selected from two men and two women. What is the probability that the committee will have (a) no man? (b) one man? (c) two men?

A box $X$ contains 2 white and 3 black balls and another bag Y contains 4 white and 2 black balls. One bag is selected at random and a ball is drawn from it. Then the probability for the ball chosen be white is

Five ordinary dice are rolled at random and the sum of the numbers shown on them is 16.What is the probability that the numbers shown on each is any one from 2, 3, 4 or 5?