In a survey concerning the smoking habits of consumers it was found that `50%` smoke cigarette A, `45%` smoke B, `40%` smoke C, `25%` smoke A and B, `10%` smoke B and C, `16%` smoke C and A, `8%` smoke all the three brands. What percentage do not smoke ?

In a town of 10000 families, it was found that 40% families buy newspaper A, 20% families buy newspaper B, 10 % families buy newspaper C, 5% families buy A and B, 3% buy B and C and 4 % buy A and C. If 2% families buy all the three newspaper. Find (i) the number of families which buy newspaper A only.

In a city three daily newspapers X,Y,Z are published, 65% of the citizens read X, 54% read Y, 45% read Z, 38% read X and Y, 32% read Y and Z, 28% read X and Z , 12% do not read any one of these three papers. If the total number of people in the city be 1000000 find the number of citizens who read all the three newspapers. [You may use a Venn diagram or a standard formula for the enumeration of elements of sets.]

In a survey of college students it was found that 40% use their own books, 50% use library books, 30% use borrowed books, 20% use both their own books and library books. 15% use their own books and borrowed books, 10% use library books and borrowed books, and 4% use their own books, library books and borrowed books. Calculate the percentage of students who do not use a book at all.

If b alpha a^3 and a increases in 10% then find what percent b will be increased?

Interset of Rs. a for b months in 10% simple intereset per annum is

A is 10% older than B and B is x% younger than A. Then value of x is :

In a certain city, only 2 newspapers A and B are published. It is known that 25% of the city population read A and 20% read B while 8% reads both A and B. It is also known that 30% of those who read A but not B look into advertisement and 40% of those who read B but not A look into advertisements while 50% of those who read both A and B look into advertisements. What is the percentage of the population who read an advertisement?

A can solve 75% of the problems in this book and B can solve 70% . What is the probability that either A or B can solve a problem chosen at random ?

A factory has two machines A and B. Past record shows that machine A produced 60% of the items of output and machine B produced 40% of the items. Further, 2% of the items produced by machine A and 1% produced by machine B were defective. All the items are put into one stockpile and then one item is chosen at random from this and is found to be defective. What is the probability that it was produced by machine B?

Answer all questions: The C.V of poisson distribution is 25% fund its mean.