I need help figuring out Column 3 and column 4 I do not understand.

In Table 2, construct a relative frequency distribution for the number of heads in four coin flips.

In the second column, enter the number of times that 0, 1, 2, 3, or 4 heads were observed. (Remember: This column should add up to 20!).

In the third column, enter the proportion (relative frequency) of times 0, 1, 2, 3, or 4 heads were observed. (This column should add up to 1 or 100%!).

In the fourth column, enter the theoretical probabilities from using the Binomial Distribution. To find these probabilities, you may use the Binomial formula or the TI-84 command (binompdf). N is 4, p is 0.5, and x is the number of successes (so you will compute 5 probabilities, one each for 0, 1, 2, 3, and 4). Again, this column should add up to 1 or 100%.

TABLE 2

NUMBER OF HEADS (X)	frequency	Relative frequency	Theoretical probability binomPDF
0	1
1	9
2	5
3	4
4	1
TOTAL	20