Wristwatch Errors As part of a project for a statistics class, a student collects data on wristwatch accuracy. The following error times (in seconds) are obtained. (Positive values represent watches that are ahead of the correct time, and negative values represent watches that are behind the correct time.)

140 2125 105 2241 285 41 186 2151 325 80 27 20 20 30 265

a. Find the mean, median, mode, and midrange.

b. Find the standard deviation, variance, and range.

c. Are the given times from a population that is discrete or continuous?

d. What is the level of measurement of these values? (nominal, ordinal, interval, ratio)