1.

The probability that a patient recovers from a particular disease is 0.7. Of the next 10 people to enter hospital with this disease, what is the probability that: a) At least 6 survive? b) 4, ,5 6or 7survive?

2. The probability of any warning device failing to function is 0.2. If 10 such devices are installed, what is the probability that not more than 6 fail to function when needed?

3. An engineer imports computer chips from a manufacturer for updating her company's 10 CAD/CAM computers. Each computer requires just one chip to be replaced to update the system. The engineer knows that about 5% of the manufacturer's chips are faulty. a) What si the probability that al ten chips purchased are not faulty? b) What is the probability that at least one is faulty?