Additional help on the assignment

I strongly recommend that you complete this assignment with lots of light (during the day - outside, or inside with lots of windows)

Aperture (f) sequence: 3.5; 4; 4.5; 5; 5.6; 6.3; 7.1; 8; 9; 10; 11; 13; 14; 16; 18; 20; 22.

Here is a step by step on how to complete the assignment:
1. Determine the correct exposure. Start by using your largest aperture (likely 3.5-5.6) and 1/60th of a second for shutter speed. Change your ISO until your meter indicates a correct exposure (the little bar lines up with the 0 on the meter). Take the photo. Review it. How does the histogram look? Remember you want the data on the right to just kiss the wall on the right. If there is a large gap between the right most part of the data and the wall, increase your ISO further. Repeat the process until it is properly exposed.
At that point, you will have your first properly exposed photo in the series.
2. Change your aperture by a full stop. For almost all of you that is 3 clicks of the dial. Assuming your maximum aperture was 3.5, then that would  be f5 (see the chart above which indicates the aperture in 1/3 stop increments). Since that results in your exposure being 1 stop darker, you have to compensate by adjusting either your shutter speed or ISO one full stop. Assuming you don't have a tripod, you want to avoid using a shutter speed of less than 1/60, so in this scenario, you would be left with adjust your ISO by 1 full stop. That would mean increasing your ISO by doubling the number (i.e- 200 to 400, 800-1600, etc..)
So, while you lost 1 stop of light by using a smaller aperture, you 'gained' it back by increasing your ISO by 1 stop.
NOTE: You can also change your shutter speed as you change your aperture rather than your ISO. In fact, if you are outside on a sunny day or have lots of light indoors, start the series using a much faster shutter speed than 1/60. Then change your shutter speed to a slower one as you make your aperture smaller.

Repeat this process until you have gone through you aperture range in full stop increments (should be around 5-7 shots)

You may also find the resources on this web page helpful - the charts with fractional shutter speeds and apertures towards midway down in particular.