If the mean of numbers 28, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 280, 511, 1023 and x?  Options:
A) 395 B) 375.8 C) 355 D) 415 E) 365
The mean of numbers 28, x, 42, 78 and 104 is 62: 28+x+42+78+104=62*5 --&gt; x=58;   So, the mean of 128, 255, 511, 1023 and x is (128+255+280+511+1023+58)/6=375.8.   Answer: 375.8.
<result>B</result>
If the mean of numbers 28, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 280, 511, 1023 and x?