The following numbers represent the ages of people on a bus: 3, 6, 27, 13, 6, 8, 12, 20, 5, 10. Calculate their mean of their ages.

Find the IQR for the following data set: 3, 5, 7, 8, 9, 11, 15, 16, 20, 21.

Find the IQR for the following data set: 5, 7, 4, 4, 6, 2, 8.

The following represents age distribution of students in an elementary class. Find the mode of the values: 7, 9, 10, 13, 11, 7, 9, 19, 12, 11, 9, 7, 9, 10, 11.

Find the mean of these set of numbers: 100, 1050, 320, 600 and 150.