Find the mode of the given data:

10, 8, 4, 7, 8, 11, 15, 8, 4, 2, 3, 6, 8

Find the median of first nine even natural numbers.

The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.

Given below are heights of 15 boys of a class measured in cm:

128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150, 142, 154.

Find

A. The height of the tallest boy.

B. The height of the shortest boy.

C. The range of the given data.

D. The median height of the boys.

Observe the data and answer the questions that follow:

16, 15, 16, 16, 8, 15, 17

A. Which data value can be put in the data so that the mode remains the same?

B. At least how many and which value(s) must be put in to change the mode to 15?

C. What is the least number of data values that must be put in to change the mode to 17? Name them.