Question
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 226.7-cm and a standard deviation of 1.1-cm. For shipment, 9 steel rods are bundled together.

Find the probability that the average length of a randomly selected bundle of steel rods is between 227.7-cm and 227.7-cm.
P(227.7-cm < M < 227.7-cm) = 

Enter your answer as a number accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

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Probability Distributions

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