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It depends. The blended tax rate tends to be a complicated formula and is not just Line 18 divided by Line 15 on your 1040. 

Income is the Adjusted Gross Income from Form 1040, line 11. Then, make the following adjustments:

+lump-sum distributions from qualified retirement plans and special averaging or capital gain treatment is selected on Form 4972

+Also, if the distributions include net unrealized appreciation in employer's securities, and the option is selected on Form 4972 to include this in the tax calculation, the amount of the net unrealized appreciation is also added to the income

=Income for the Effective Tax Rate Calculation

Tax is calculated starting from Form 1040, line 15. Then, make the following adjustments:

• the recapture tax from Form 8863 (Education Credits) or the tax from the IRC Section 197(f)(9)(B)(ii)election for an additional tax
• the smaller of the nonrefundable credits shown on line 55 of Form 1040 or the remaining tax is then subtracted 
• Taxes shown on lines 57 through 61 on Form 1040
• the Fuel Tax Credit from Form 4136
• the Child Tax Credit from Schedule 8812
• the refundable portion of the American Opportunity Credit from Form 8863
• the Net Premium Tax Credit from Form 8962
• the Health Coverage Tax Credit from Form 8885
• the Credit for U.S. Tax Paid to the Virgin Islands and the Earned Income Tax Credit

=Tax Amount for Effective Rate Calculation

@Danielbarrett