number of miles (in thousands) that a car's tire will function before needing replacement is 66 and the standard deviation is 20. Suppose that 16 randomly selected tires are tested. Round all answers to 4 decimal places where possible and assume a normal distribution. What is the distribution of XX? XX ~ N ( 66 , 20 ) What is the distribution of ¯xx¯? ¯xx¯ ~ N ( 66 , 5 ) If a randomly selected individual tire is tested, find the probability that the number of miles (in thousands) before it will need replacement is between 70.3 and 77.6. 0.1319 incorrect For the 16 tires tested, find the probability that th

A First Course in Probability (10th Edition)
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ISBN:9780134753119
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Chapter1: Combinatorial Analysis
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The average number of miles (in thousands) that a car's tire will function before needing replacement is 66 and the standard deviation is 20. Suppose that 16 randomly selected tires are tested. Round all answers to 4 decimal places where possible and assume a normal distribution.

  1. What is the distribution of XX? XX ~ N ( 66 , 20 )
  2. What is the distribution of ¯xx¯? ¯xx¯ ~ N ( 66 , 5 )
  3. If a randomly selected individual tire is tested, find the probability that the number of miles (in thousands) before it will need replacement is between 70.3 and 77.60.1319 incorrect
  4. For the 16 tires tested, find the probability that the average miles (in thousands) before need of replacement is between 70.3 and 77.60.1847
  5. For part d), is the assumption that the distribution is normal necessary? Yes
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