Homework Help: statistics

Posted by Victor on Tuesday, October 18, 2011 at 11:45pm.

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 121.2-cm and a standard deviation of 1.8-cm.

Suppose a rod is chosen at random from all the rods produced by the company. There is a 23% probability that the rod is longer than:

Enter your answer as a number accurate to 1 decimal place. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

statistics - PsyDAG, Wednesday, October 19, 2011 at 2:34am
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion in the smaller area (.23) and its Z score. Use the equation below.

Z = (score-mean)/SD

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