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A tire company has developed a new type of steel-belted radial tire. Extensive testing indicates the population of mileages o

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Answer #1

Given that,

mean = \mu = 40839

standard deviation = \sigma = 4056

Using standard normal table,

P(Z < z) =0.02

= P(Z < z ) = 0.02

z = -2.05

Using z-score formula  

x = z \sigma + \mu

x = -2.05 *4056+40839

x = 32524.2

k=x=32524.2

k=32524

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