Based on the provided reference from December 2010, it's impossible to determine the exact number of people who owned an iPad at that time. The reference states that nine million Americans owned tablets in general (including iPads and other brands), representing about 3% of the US population then.
The reference also indicates that the iPad and its "cousins" were gaining popularity, with 17% more people intending to buy one in the following three years.
Therefore, it is not possible to give an exact answer to the question "How many people have an iPad?" based solely on the provided information. The reference only provides information about tablet ownership in general and future purchase intentions. Furthermore, the data is from 2010, which is severely outdated. An accurate number would require up-to-date sales figures from Apple and market research data.
