$\text{ i. }\theta =10.2^{\circ },20.5^{\circ },30.8^{\circ },41.1^{\circ },51.4^{\circ },\text{ ii. Yes, the student is standing at an angle of destructive interference. }$

$\text{ i. }\theta =5.0^{\circ },15.0^{\circ },25.0^{\circ },35.0^{\circ },45.0^{\circ },\ \text{ii.}\text{ Yes, the student is standing at an angle of destructive interference. }$

$\text{ i. }\theta =6.15^{\circ },18.7^{\circ },32.4^{\circ },48.6^{\circ },74.6^{\circ },\ \text{ii.}\text{ No, the student is not standing at an angle of destructive interference. }$

$\text{ i. }\theta =7.5^{\circ },22.5^{\circ },52.5^{\circ },67.5^{\circ },74.6^{\circ },\ \text{ ii.}\text{ No, the student is not standing at an angle of destructive interference. }$