At the time of considering giving up the old imperial system of measurement of feet and inches in the UK, a Gallup poll ran a survey to discover what people understood of the metric system. They found that 33 per cent of university graduates had never heard of it.
At roughly the same time a Sunday newspaper ran a similar poll and proudly declared that 98 per cent of its readers knew about the metric system
Why the difference?
To find out, read the following classic book on statistics by Darrel Huff. Recommended.
The book can be downloaded free.