Out of 800 families with 4 children each, how many families would you expect to have 2 boys and 2 girls each?

# Mathematics

## Which of the following is correct for normal curve? &….

Which of the following is correct for normal curve?

## Under a normal curve, mean 3 s covers an area equal to….

Under a normal curve, mean 3 s covers an area equal to

## In a factory producing ball point pens, it is found that one out of 50 pens is defective. The pens a….

In a factory producing ball point pens, it is found that one out of 50 pens is defective. The pens are placed in packets of 10 each. Use Poisson distribution to find the number of packets containing more than 2 defective pens in a consignment of 10,000 packets.

## A carton contains 20 bulbs, out of which 5 are defective. If a sample of 3 bulbs is selected at rand….

A carton contains 20 bulbs, out of which 5 are defective. If a sample of 3 bulbs is selected at random, find the probability that 2 of them are defective bulbs.

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## A and B stand in a ring with 10 other persons. If the arrangement of the persons is at random, then ….

A and B stand in a ring with 10 other persons. If the arrangement of the persons is at random, then the probability that there are exactly 3 persons between A and B is

## A telephone switchboard handles 600 calls per hour during a rush hour. The board can make a maximum ….

A telephone switchboard handles 600 calls per hour during a rush hour. The board can make a maximum of 20 connections per minute. If the number of calls follows Poisson distribution, the probability that the board will be over taxed during any minute is

## The value of m for Poisson’s distribution is….

The value of m for Poisson’s distribution is

## The mean height of soldiers is 68.52 inches with variance of 10.8 inches. How many soldiers in a reg….

The mean height of soldiers is 68.52 inches with variance of 10.8 inches. How many soldiers in a regiment of 1000 would you expect to be over 6 feet?

## Past records show that on an average, 1 house out of 1000 in a certain district has a fire during a ….

Past records show that on an average, 1 house out of 1000 in a certain district has a fire during a year. If there are 2000 houses in that district, the probability that 5 houses will have a fire is

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