Susan's checkbook had a balance of $422.05 on April 1. On April 5, she wrote a check for $106.30 auto repair shop. On April 7, she wrote a check in the amount of $310.00 for
rent. On April 9, her dad sent her $95.00 to deposit into her account.

If you are just building your payment history, how many points from a perfect score will you possibly miss?

What is negative 3/9 times negative 2/8 ?

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?