Class 6 and Class 2 conducted a sports standard test. There were 76 students who met the standard, and 4 students who failed to meet the standard. What is the rate of non-compliance?
六2班进行体育达标测验，达标的同学是76人，没达标的同学是4人，未达标率是多少．
<gadget id="calculator">76 + 4</gadget>
<output>80</output>

<gadget id="calculator">4 / 80</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/20) * 1</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>