Mathematics, 27.02.2020 18:49 paras29
The lifetime of disc brake pads varies according to a normal distribution with mean μ = 50,000 miles and standard deviation σ = 3000 miles. (a) What is the probability the lifetime of a random sampled brake pad is 47,000 miles or less? (b) What is the distribution of the mean lifetime X of 9 randomly sampled brake pads? (c) What is the probability the mean lifetime of 9 randomly sampled brake pads is less than 47,000 miles?
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The lifetime of disc brake pads varies according to a normal distribution with mean μ = 50,000 miles...
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