A rain barrel holds 52 gal. 3 qt of water. Mr. Blanco uses 8 gal. 2 qt. to water his vegetable garden and 4 gal. 3 qt. to water his flowers. How much water is left in the rain barrel?
48 gal.
12 gal. 5 qt.
39 gal 2 qt.
40 gal. 2 qt.

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?