How can this 'top' command output make sense? Load over 7 and total CPU use ~5%

[Wojciech Puchar]

>> first - says that it's measure of CPU load
>> then - "or waiting for short-term events such as disk I/O" - which is NOT
>> measure of CPU load.
>
>     You are mistaken.  I think what you are referring to is the percentage of

no i'm not. doing lots of I/O and little CPU load produces high "load 
average".

the explanation from the book is wrong.