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What is not true about kl and mn? what is mn? (show )

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2