statistics
posted by Victor
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 121.2cm and a standard deviation of 1.8cm.
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 zscores or zscores rounded to 3 decimal places are accepted.

PsyDAG
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 = (scoremean)/SD
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