the file exam1.xlsx, sheet named salary, contains salary data on all major league baseball players for year 2015. indicate the level of data measurement for salary. [hint: whether nominal, ordinal, interval or ratio.] construct a histogram using 10 class intervals for the salary variable. what does the histogram tell us about the salary of the major league baseball players for 2015? write a paragraph. calculate the values of mean, and median for salary. calculate the skewness for salary (note: use excel function skew). is the distribution of the salary skewed? negatively or positively? based on your answer for part (e), which measure, mean or median, should be used as measure of central tendency? why? justify.