80% of all families own a television set. If 10 families are interviewed at random, then the probability that at most three families own a television set is

Supose that 80 % of all families own a elevision set. If 10 families are interviewed at random, find the probability that seven famileis own a television set .

Suppose that 80% of all families own a television set. If 5 families are inervised at random, find the probability that : (a) three families own a television set. (b) at least two families own a television set.

In a colony there are 75 families and each family has two children. Th number of made children of the families is as follows: If a family is selected at random, what is the probability that the family has only one male child?

There are two children in a family. Find the probability that at most one boy is there in the family.

There are two children in a family. Find the probability that at most one boy is there in the family.

In a large metropolitan area, the probabilities are .87,.36,.30 that a family (randomly chosen for a sample survey) owns a colour television set, a black and white television set, or both kinds of sets. What is the probability that a family owns either anyone or both kinds of sets ?

In a certain town, 60% of the families own a car, 30% own a house and 20% own both car and house. If a family is randomly chosen, then what is the probability that this family owns a car or a house but not both?

In a certain town 25% families own a cell phone, 15% families own a scooter and 65% families own neither a cell phone nor a scooter. If 1500 families own both a cell phone and a scooter, then the total number of families in the town is