5.70 Refer to Exercise 5.69. The company purchasing the machines returns the defective ones for repair. If

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5.70 Refer to Exercise 5.69. The company purchasing the machines returns the defective ones for repair. If it costs $50 to repair each machine, find the mean and variance of the total repair cost. In what interval would you expect the repair costs on these five machines to lie? [Hint: Use Tchebysheff’s Theorem.]

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