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357 is what percent of 420?

What kind of bond pays interest which is exempt from tax?

What numbers are included in the set of integers? what numbers are not included?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?