the number divisible by 3 is 36 0r 16 0r 45 0r 12
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This is a classic example of finding mean and standard deviation using Z values.
From this page find the Z value corresponding to 31% area under the curve and 92% (100-8) percent area under the curve.
Math Is Fun Virtual Manipulative
Note: You'll probably be given tables to lookup in your quizzes.. they're a bit confusing. But you might as well learn how to use it.
As you know:
Z=X−μσZ=X−μσ
Put in X and Z values values twice, you'll have two linear equations. Solve them and the answer is yours!
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6 ,9 ,15 ,18 ,21 ,24 ,27 ,30
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