Wires manufactured for use in a computer system are specified to hve resistances

Question

Wires manufactured for use in a computer system are specified to hve resistances between .12 and .14 ohms. The actual measured resistances of the wires produced by company A have a normal probability distribution with mean .13 ohm and standard deviation .005 ohm.

a) What is the probability that a randomly selected wire from company A's production will meet the specifications?

b) If fourof these wires are used in each computer system and all are selected from company A, what is the probability that all four in a randomly selected system will meet the specifications?

Explanation / Answer

normcalcdf(0.12,0.14,0.13,0.005) = 0.9545

(0.9545)4 = 0.83

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