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a school spent $150 on advertising for a breakfast fundraiser. each plate of food was sold for $8.00 but cost the school
$2.00 to prepare. after all expenses were paid the school raised $2.400 at the fundraiser which equation can be used to
find x, the number of plates that were sold?
6x - 150 = 2,400
6x + 150 = 2,400
10x - 150 = 2,400
10x + 150 = 2,400

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?