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Mean and Standard Deviation?

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The test scores were normally distributed with a mean of 43 and a standard deviation of 3.

(a) Approximately what percentage of the scores lies between 40 and 46?

(b) Approximately what percentage of the scores lies between 43 and 46?
 Feb 14, 2014

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Village_Chief:

The test scores were normally distributed with a mean of 43 and a standard deviation of 3.

(a) Approximately what percentage of the scores lies between 40 and 46?

(b) Approximately what percentage of the scores lies between 43 and 46?



Approx 68% of scores lie within one standard deviation of the mean.
Really, this is so easy you should not need more help.

140214 normal curve z scores.JPG
 Feb 14, 2014

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