Every month for the past two years a poll was taken to measure the perceptions of the people who rate the president of the Philippines as to his job performance. The percentage of those who judged that performance is satisfactory are listed below:

63 67 79 80 54 53 54 49 68 69 50

a. Find the mean, median and mode.

b. Determine the quartile values and the IQR.

c. Determine the lower and upper bounds for the data set. Are there outliers? Justify.

d. Find the variance, standard deviation and coefficient of variation of the first 6 values in the given sample data.