The average mark of a class of twenty students is 64. If three students whose marks are 32,28 and 34 are removed , then find the approximate average mark of the remaining students of the class.
Choose the correct choice from the following answers:	A) 71	B) 74	C) 57	D) 70	E) 80
Exp. Total mark of 20 students = 64*20= 
<gadget id="calculator">64*20</gadget>
<output>1_280</output>
1280,   Total mark after the removal of 3 students= 1280 –(32 +28+34 )   = 1280 – 94 = 1186   Approximate average mark = 1186/(20-3) = 1186/ 17 = 70   Answer: 70
<result>D</result>
The average mark of a class of twenty students is 64. If three students whose marks are 32,28 and 34 are removed , then find the approximate average mark of the remaining students of the class.