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In testing a certain kind or truck tire over rugged terrain, it is found that 30% of the trucks fail to complete the test run

In testing a certain kind or truck tire over rugged terrain, it is found that

30% of the trucks fail to complete the test run without a blowout.

(a) Of the next 14 trucks tested, how many of them would you expect to have blowouts?

(b) What is the variance of the number of blowouts experienced by the 14 trucks? What does that mean?

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