Using a vernier caliper and graduated cylinder, how would one go about determining the aggregate volume, the diameter and radius of a group of M &...

The photographs you provided depict what appear to be M
& M candies.  My assumption is that you are tasked with determining the combined
volume of the candies in cubic centimeters, plus the diameter and radius of an
individual candy.

First, use the calipers to measure the
diameter of several candies.  They should all be about the same…but take an average of
10 or 12.

Then, determine the radius by dividing the
diameter by 2.

Finally, to determine the combined volume,
partially fill the graduated cylinder with water and record the volume in cubic
centimeters.  Add the candies and record the new volume.  The volume of the candies is
the difference.