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Explanation & Answer
It's 0.9544 :)
300 is -2 standard deviations from the mean, and 700 is +2 standard deviations from the mean.
So in total, you are 4 standard deviations spread across the normal distribution, or:
P ( -2 < Z < 2), for which I used a probability table to get 0.9544.
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3 pages
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