In Question 11: (a) What are the scores at 1SX and + 1SX from the mean?

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In Question 11:
(a) What are the scores at — 1SX and + 1SX from the mean?
(b) If N is 1000, how many people do you expect will score between 1.59 and 6.61?
(c) How many people do you expect will score below 1.59?
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