3.7 In testing a certain kind of truck tire över rugged terrain, it is found that 25% of the trucks fail to complete the test run without a blowout. Of the next 15 trucks tested, find the probability that

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Chapter1: Combinatorial Analysis
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3.7 In testing a certain kind of truck tire over rugged
terrain, it is found that 25% of the trucks fail to complete
the test run without a blowout. Of the next 15
trucks tested, find the probability that
(a) from 3 to 6 have blowouts;
(b) fewer than 4 have blowouts;
(c) morejthan 5 have blowouts.
3.11 It is known that 60% of mice inoculated with a
serum are protected from a certain disease. If 5 mice
are inoculated, find the probability that
(a) none contracts the disease;
(b) fewer than 2 contract the disease;
(c) more than 3 contract the disease
Transcribed Image Text:3.7 In testing a certain kind of truck tire over rugged terrain, it is found that 25% of the trucks fail to complete the test run without a blowout. Of the next 15 trucks tested, find the probability that (a) from 3 to 6 have blowouts; (b) fewer than 4 have blowouts; (c) morejthan 5 have blowouts. 3.11 It is known that 60% of mice inoculated with a serum are protected from a certain disease. If 5 mice are inoculated, find the probability that (a) none contracts the disease; (b) fewer than 2 contract the disease; (c) more than 3 contract the disease
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