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PLEASE ANSWER WITHIN 15 MINUTES

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PLEASE ANSWER WITHIN 15 MINUTES
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6. You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is x = 50 months. Suppose that the lifetimes for tires of this brand follow a normal distribution, with unknown mean and standard deviation o= 5 kg. 6. What type of sampling distribution is valid for this problem? (a) Z-distribution (b) t-distribution, (c) F-distribution (d) Uniform distribution.
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