Employee	Ethnic Group	Gender	Rank	Pay Scale
Maria	Asian American	Female	3	A
Peter	White American	Male	2	B
George	Hispanic American	Male	1	C
Smith	Black American	Female	1	D
Johnson	Alaska Native	Male	2	E
Thompson	Asian American	Male	2	B
Martinez	Alaska Native	Male	3	A
Lewis	White American	Female	2	B
Lee	Black American	Male	2	A
Taylor	Asian American	Female	1	B
Carter	Asian American	Male	2	C
Edwards	Hispanic American	Male	2	E
Bailey	White American	Male	2	B
Cooper	White American	Male	2	A
Bill	Alaska Native	Male	3	E
Cox	Asian American	Male	1	A
Perry	HispanicAmerican Female	Female	2	C
Flores	Alaska Native	Female	2	B
Woods	White American	Male	3	E
Cole	Asian American	Female	1	A

Calculate the cumulative relative frequency for employees with a pay scale of A and B

a. 0.80

b. 0.60

c. 0.40

d. 20