The following data represent the prices (in Philippine peso) of premium gasoline sold in 35 selected outlets in Metro Manila prior to the implementation of the gasoline price cap through Executive Order 839:

36.40	39.00	40.00	37.90	38.00	36.40	36.80
36.70	38.80	39.70	36.70	38.10	36.80	36.40
38.00	36.10	36.80	36.70	39.00	37.20	37.00
36.10	36.50	36.40	37.00	36.50	37.40	37.00

a. Develop the ordered array.

b. Form the stem and leaf display.

c. Construct the frequency distribution using 5 classes.

d. Is the concentration of values similar for all three types of presentation?