It is known that 85% of all racing cars will develop some sort of engine problem during a race. If there are 15 cars in a race, find the probability that at least 11 will develop engine
problems

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2