If the mean of numbers 12, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x?
Choose the correct choice from the following answers:
A) 395  B) 275  C) 355  D) 415  E) 398.2
The mean of numbers 12, x, 42, 78 and 104 is 62: 12+x+42+78+104=62*5 --&gt; x=74;   So, the mean of 128, 255, 511, 1023 and x is (128+255+511+1023+74)/5=398.2.   Answer:398.2.
<result>E</result>
If the mean of numbers 12, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x?