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Assignment

A middle school principle has a 100 eighth grade students taking a standardized test with a mean equal to 400 with a standard deviation of 70. The scores are normally distributed.  What is the probability that the group of 100 students will have a mean score below 385?  Use te z-score table.

A middle school principle has a 100 eighth grade students taking a standardized test with a mean equal to 400 with a standard deviation of 70.
The scores are normally distributed.  What is the probability that the group of 100 students will have a mean score below 385?  Use te z-score table.