If the mean of the data set is 25 the standard deviation is 2.5 and distribution of the data value is approximately normal about 99.7% of the data values fall in what interval centered on the mean A) 22.5 to 27.5
B) 17.5 to 25
C) 17.5 to 32.5
D) 20 to 30

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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6 spoons of sugar for every 21 cups of flour

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