A PCR-RFLP analysis was performed to identify PTC tasters in a population. The taster allele sequence included a palindromic sequence recognized by a restriction enzyme, whereas the non-taster allele did not due to a SNP in the sequence. The gel shows the results of the analysis from 100 individuals. The numbers above the gel lanes represent the number of individuals with each genotype. Required:
What is the frequency of the non-taster allele in this population?