Probability d. What proportion of the samples will have a mean useful life between 36.5 and 38.5 hours? Probability

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Q: solution r^3 = 36r

A: The given equation is a third degree equation. So it has 3 solutions.

Q: solve remaining parts also please asap

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Q: 4. Prove or Disprove: For anynxn matrix A, A A = AA.

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