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What percentage of a normal distribution is found within a range of z scores from -2...

What percentage of a normal distribution is found within a range of z scores from -2 to +2?

Please explain. I have a test tomorrow and have no clue how to figure this one out and can't find it in my book or notes!

Math   Statistics-And-Probability   
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Answer #1

=0.9773-0.0228...............................................by using normal probability table.

=0.9545

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