Sarah makes and sells pottery bowls. she has costs totaling $10,000 per year plus a cost of $7 for each bowl she makes. if she sells the bowls for $25 each, what is the minimum number she must sell each year to earn at least $25,000 profit?

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life b = 2. if 100 of these switches are installed in dif- ferent systems, what is the probability that at most 30 fail during the first year?