The average (arithmetic mean) of seven numbers is 7. If 4 is subtracted from each of three of the numbers, what is the new average?
Choose the correct answer.
A) 4.2  B) 6.3  C) 5.2  D) 7.9  E) 8.3
Sum of 7 numbers = 7*7= 
<gadget id="calculator">7*7</gadget>
<output>49</output>
49   If4 is subtracted from each of three of the numbers , we subtract  4*3= 
<gadget id="calculator"> 4*3</gadget>
<output>12</output>
12 from the total sum   Sum of 7 number after subtracting 4 from each of three of the numbers=49-12= 
<gadget id="calculator">49-12</gadget>
<output>37</output>
37   New average= 37/7=5.2   Answer 5.2
<result>C</result>
The average (arithmetic mean) of seven numbers is 7. If 4 is subtracted from each of three of the numbers, what is the new average?