A certain data is presented in the form of a frequency distribution using same class size. If the class mark of the first class interval is 70, and the class size is 20, then the upper limit of the seventh class interval is:

A certain data is presented in the form of a frequency distribution us

1.	A certain data is presented in the form of a frequency distribution using same class size. If the class mark of the first class interval is 70, and the class size is 20, then the upper limit of the seventh class interval is:
A.	160
B.	220
C.	200
D.	140
Answer» D. 140