1. A packet contains 100 washers, 24 of which are brass, 36 copper and the remainder steel. One washer is taken at random, retained, and a second washer similarly drawn. Determine the probability that:
2. Both washers are steel
3. The first is brass and the second copper
4. One is brass and one is steel.

1. In a pack of playing cards, find the following probabilities:
2. That a diamond card will be drawn at random.
3. That a 4 or a 5 will be drawn
4. That a jack of ace will be drawn.

1. Listening to loud music for protracted periods can cause permanent damage to hearing.
2. What are the variables?
3. State the null and the alternative hypotheses.

1. It is understood that Asian elephants are smaller in size than tropical African elephants. State the null and alternative hypotheses.