Find the common difference of the arithmetic sequence -19, -16, -13, ...

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The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top