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1. The amount of time a tire lasts is normally distributed with a mean of 30,000...

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Statistics

1. The amount of time a tire lasts is normally distributed witha mean of 30,000 km and standard
deviation of 2000 km.
(a) 68% of all tires will last between ____________ km and_____________ km.
(b) 95% of all tires will last between ____________ km and_____________ km.
(c) What percent of the tires will have a life that exceeds 26,000km? _________
(d) What percent of the tires will have a life that lasts between28,000 and 34,000 km? ______
(e) If a company purchases 2000 tires, how many tires are expectedto last
ï‚· more than 28,000 km? ___________
ï‚· between 24,000 and 32,000 km? ____________

Answer & Explanation Solved by verified expert
4.4 Ratings (730 Votes)
awe need to convert 68 into twosided z valueso we haveWith the help of formula for z we can say that68 of all tires will last between 28011 km and31989 kmbwe need to convert 95 into    See Answer
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