In: Economics
the lifetimes of its tires follow a normal distribution with
mean 48,000 miles and standard deviation 5,000 miles.
·a well-labeled sketch of this normal distribution
·the z-score corresponding to 55,000 miles
·the probability that a randomly selected tire lasts for more than 55,000 miles
·the manufacturer wants to issue a guarantee so that 99% of its tires last for longer than the guaranteed lifetime, what z-score should it use to determine that guaranteed lifetime
·the manufacturer wants to issue a guarantee so that 99% of its tires last for longer than the guaranteed lifetime, how many miles should it advertise as its guaranteed lifetime