Please help

A random sample of 18 purchases showed the amounts in the table (in $). 2.46 80.38 41.23 41.650 The mean is $44.79 and the standard deviation is $23.88. 22.46 43.61 43.62 5.90 a) What is the standard error of the mean? 64.88 82.45 82.67 67.74 b) How would the standard error change if the sample size had been 2 29.66 30.37 30.38 50.67 instead of 18? (Assume that the sample standard deviation didn't change.) 51.16 34.97 a) The standard error of the mean is (Round to two decimal places as needed.)