Find average of different wave lengths

Hi every one,

Thanks for the reply. But i have 2 variables here depending on which the average should be calculated. Sorry, i didn't mentioned it before. What I would like to find is the average of column D (number) with respect to column A (Genotype ) and also different wave length (Column C).
ie; Genotype 1 to its corresponding value in column D for wavelenghth 450
Genotype 1 to its corresponding value in column D and for Wave length 470 to and so on.


Thanks in advance for your reply