You may see a problem like the following a mean score of 20


Can someone explain this to me? Or draw it out so that I can understand.

You may see a problem like the following: a mean score of 20 and SD of 3, and asked what percentage of cases will be between 17 and 23, you would respond 68% which is 1SD above and below the mean.

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Basic Statistics: You may see a problem like the following a mean score of 20
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