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Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Anyone know? is appreciated! will mark brainliest if correct!