The probability that a mountain-bike rider travelling along a certain track will have a tyre burst is 0.05.Find the probability that among 17 riders:(iii)two or more have burst tyres.

The probability that a mountain-bike rider travelling along a certain track will have a tyre burst is 0.05.Find the probability that among 17 riders:(ii)at most three have a burst tyre.

The probability that a mountain-bike rider travelling along a certain track will have a tyre burst is 0.05.Find the probability that among 17 riders:(i)exactly one has a burst type

The probability that a bulb produced by a factory will fuse 150 days of use is 0.05.Find the probability that out of 5 such bulbs(iii)more than one

If the probability that a flourescent light has a useful life of atleast 800 hours is 0.9,find the probabilities that among 20 such lights atleast 2 will not have a useful life of atleast 800 hours.

Two events A and B have probability 0.28 and 0.55 respectively. The probability that A and B occur simultaneously is 0.14. Find the probability that neither A nor B occurs

The centres for disease control have determined that when a person is given a vaccine,the probability that the person will develop immunity to a virus is 0.8.If eight persons are given this vaccine,find the probability that (iii)all will develop immunity.

Calculate the optimum speed and maximum speed of a four wheeler travelling along a curve track of radius 80 m. If the road is banked at an angle of 21^@ 48' and the coefficient of friction between the tyres and the road is 0.5.