A cab driver 5days income was $300, $150, $750, $400 , $500. Then his average income is? Options:  A) $ 500  B) $ 650  C) $ 420  D) $ 375  E) $ 625

Rationale: "avg = sum of observations / number of observations avg income = ( 300 + 150 + 750 + 400 + 500 ) / 5 = 420 answer is c"
Answer: C