The probability P of choosing an object at random from a group of objects is found by the fraction P(event) = Number of favorable outcomes
Total number of outcomes
. Suppose the angle measures 33°, 57°, 123°, 147° are written on slips of paper. You choose two slips of paper at random.

What is the probability that the measures you choose are complementary?

The probability of choosing complementary measures is .

What is the probability that the measures you choose are supplementary?

The probability of choosing supplementary measures is .

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?