If the mean of numbers 28, x, 42, 78, 82 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x?	Choose one.
A) 395  B) 275  C) 391  D) 415  E) 365
The mean of numbers 28, x, 42, 78 and 104 is 62: 28+x+42+78+82+104=62*6 --&gt; x=38;   So, the mean of 128, 255, 511, 1023 and x is  (128+255+511+1023+38)/5= 
<gadget id="calculator"> (128+255+511+1023+38)/5</gadget>
<output>391</output>
391.   Answer: 391.
<result>C</result>
If the mean of numbers 28, x, 42, 78, 82 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x?