What is the average of 1200, 1300, 1400, 1510, 1520, 1530, and 1200?	Answers
A) 1360.47 B) 1355.8 C) 1380 D) 1350 E) 1333

Rationale: add 1200 , 1300 , 1400 , 1510 , 1520 , 1530 , and 1200 grouping numbers together may quicken the addition sum = 9660 9660 / 7 = 1380 c
Answer: C