where students live in residential clusters of 40 freshmen sharing a common lounge area. How many students would you expect to find in a typical cluster? With what standard deviation? international 25. Tennis, anyone? A certain tennis player makes a suc- cessful first serve 70% of the time. Assume that each serve is independent of the others. If she serves 6 times, what's the probability she gets a) all 6 serves in? b) exactly 4 serves in? c) at least 4 serves in? d) no more than 4 serves in? 26. Frogs A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had estab- lished that this trait is meually found 1 of every 8 frogs.

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