Need help with math plz plz plz plz plz plz.

Ill mark the brainliest if you me with the these three questions 7,8,9

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

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?