Ecology: Shark Attacks In Hawaii shark attacks are very rare. Furthermore, about 55% of all shark attacks are serious, but not fatal (Reference: Sharks of Hawaii, Dr. Leighton Taylor, University of Hawaii Press). You are scheduled to give a talk at a local scuba club in Honolulu and want to include a brief statistical profile regarding the most recent 6 shark attacks, all of which were nonfatal. Let r be the number of nonfatal attacks out of a random sample of 6 shark attacks.

(a) Make a histogram for the probability distribution of r.

(b) What is the probability all six shark attacks are nonfatal?

(c) What is the probability that 3 or more of the six shark attacks are nonfatal?

(d) What is the expected number of nonfatal shark attacks out of the six? What is the standard deviation of the r-probability distribution?

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