Solve the problem. Scores on a test are normally distributed with a mean of 78 and...

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Solve the problem. Scores on a test are normally distributed with a mean of 78 and a standard deviation of 14. What is the st

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$\small \\$We are going to find the z score\\ The formula we are going to use is $\\ z=\frac{x-\mu}{\sigma}\\ mean=\mu=78\\ standard\ deviation=\sigma=14\\ x=66\\ z=\frac{x-\mu}{\sigma}\\ =\frac{66-78}{14}\\ =\frac{-12}{14}\\ =-0.857142857\\ \approx-0.86$

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