It is known that `10%` of certain articles manufactured are defective . What is the probability that in a random sample of 12 such articles 9 are defective?

In a box containing 100 bulbs 10 are defective the probability that out of a sample of 5 bulbs none is defective is ?

There are 5% defective items in a large bulk of items. What is the probability that a sample of 10 items will include not more than one defective item ?

In a school, there are 1000 students, out of which 430 are giris. It is known that out of 430 , '10 %' of the girls study in class XII. What is the probability that a student chosen randomly studies in clașs XIl given that the chosen student is a girl?

A factory has two machines A and B. past record shows that machine A produced 60% of the items of output and the machine B produced 40% of the items. Future 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 choosen at random from this and is found to be defective. what is the probability that it was produced by machine B ?

Consider the random experiment of throwing two dice together What is the probability of "getting a sum 12"?

In a factory which manufactures bolts, machines A,B and C manufacture respectively 25%, 35% and 40% of the bolts. Of their outputs 5%, 4% and 2% are defective bolts. A bolt is drawn at random from the product and is found to be defective. What is probability that it is manufactured by the machine B ?

A box contains 400 electronic toy'cars.Among them,12 are defective. One toy is taken out at random.What is the probability that It is a defective toy.

A manufacturer has three machine operators A,B and C. The first operator A produces 1% defective items,whereas the other two operator B and C produce 5% and 7% defective items respectively. A is on the job for 50% of the time,B is on the job 30 % of the time and C is on the job for 20% of the time. A defective item is produced,what is the probability that it was produced by A?

Ten eggs are drawn successively with replacement from a lot containing 10% defective eggs. Find the probability that there is at least one defective egg.