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Most drivers believe they are a better than average driver, and most karaoke singers believe they a better than average singer.
It may seem unlikely, but is IS possible for most of us to be better than average. Consider IQ. The average IQ is 100. Suppose we have 100 people. 99 of them have an IQ of 101 - higher than average There is one sorry specimen with an IQ of 1. The average - mean - IQ is  
\[\frac{99 \times 101+1}{100}=100\]

99 out of this particular 100 people have a higher than average IQ.