According to the Internal Revenue Service (IRS) in 2009 the top 5% of American income earners earned more than $153,542 and the top 1% earned more than $388,806. The top 1% pays slightly more than 40% of all federal income taxes.

To determine whether Americans are aware of these figures Investor’s Business Daily randomly sampled American adults and asked “What share do you think the rich (earning more than $388,806) pay in income taxes. The categories are 1. 0% to 10%, 2. 10 to 20%, 3. 20% to 30%, 4. 30% to 40%, 5. Over 40%.

The data are stored using the codes 1 to 5. Estimate with 95% confidence the proportion of Americans who knew that the rich pay more than 40% of all federal income taxes.