A cab driver 5days income was $400, $250, $650, $400 , $500. Then his average income is?
Choose one.
A) $ 400
B) $ 420
C) $ 440
D) $ 460
E) $ 480

Rationale: "avg = sum of observations / number of observations avg income = ( 400 + 250 + 650 + 400 + 500 ) / 5 = 440 answer is c"
Answer: C