1. A company has 500 cables. A test of 40 cables selected at random showed a mean breaking 1 answer below »

1. A company has 500 cables. A test of 40 cables selected at random showed a mean breaking 1 answer below »

1. A company has 500 cables. A test of 40 cables selected at random showed a mean breaking strength of 2400 pounds (lb) and a standard deviation of 150 lb.

(a) What are the 95% and 99% confidence limits for estimating the mean breaking strength of the remaining 460 cables?

(b) With what degree of confidence could we say that the mean breaking strength of the remaining

460 cables is 2400 ± 35 lb?

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