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If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2?
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The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample
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Abag contains pieces of paper numbered from 5 to 9. a piece of paper is drawn at random. what is the theoretical probability of drawing a number less than 8?
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If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2?...
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