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MMLU / Suppose that 60% of a particular electronic part last over 3 years, while 70%…

Problem

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question

Suppose that 60% of a particular electronic part last over 3 years, while 70% last less than 6 years. Assuming a normal distribution, what are the mean and standard deviation with regard to length of life of these parts?

choices

  1. μ = 3.677, σ = 3.561
  2. μ = 3.977, σ = 3.861
  3. μ = 4.177, σ = 3.561
  4. μ = 4.377, σ = 3.261

subject

high_school_statistics

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