Blended tax rate is an accounting term and is not the same as your actual tax rate. It is a confusing term for most people. Publication 17 will show your actual tax rate.
A blended tax rate, also known as the effective tax rate, is derived from a number of factors. The effective tax rate for individuals is the average rate at which their earned income, such as wages, and unearned income, such as stock dividends, are taxed. If you received income from a variety of things like stocks and bonds, interest, dividends, or self-employment, they may all play a role in determining your blended tax rate.
For Federal income taxes, the tax rate brackets for 2024 range from 10% to 37%. To see how the tax brackets apply to you for this year, and for a tool to determine your marginal (the highest part of your income) tax rate, see here.
Also, note that taxes are often calculated using a different method than the tax tables. For example, if you have capital gains, the tax on those is calculated at the capital gain rate for your income level. If you are self-employed, you may have self-employment taxes in addition to income taxes.
You can preview your return before filing to find out how your taxes were calculated. See here for details.