In Section 3.6, I said that T scores are designed to have a mean of 50 and

Question:

In Section 3.6, I said that T scores are designed to have a mean of 50 and a standard deviation of 10 and that the Achenbach Youth Self-Report measure produces T scores. The data in Figure 3.3 do not have a mean and standard deviation of exactly 50 and 10. Why do you suppose that this is so?

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