How do you find +/- std dev? and the graph?

Indicate the coat color and the proportion of offspring with that color for each of the following crosses of rabbits. assume all are homozygous. albino x albino a) 1/4 chinchilla, 3/4, agouti b) 3/4 albino, 1/4 chinchilla c) all albino

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

In general, are there any major differences that you can see? explain