Calculate the sample mean, median, mode and the sample CV (CV = mean/variance) for the data (in ppm): 10, 15, 20, 35, 50, 65, 120, 130, 145, 155, 1.235, and 1,800. Suppose that the value 1,800 is omitted because it is due to a transcription error and should be replaced with 180.

Calculate the sample mean, standard deviation and the coefficient of variation. What conclusion do you draw from comparing the CV of these two samples (the sample that includes the value 1,800 and the sample that includes the value 180)? Suppose that the value 1.800 is not an error. How would you justify omitting it? Discuss your reasons.