Final answer:
The allele frequency of H in a Hardy-Weinburg equilibrium population with the given genotypic frequencies is calculated to be 0.61.
Step-by-step explanation:
To calculate the allele frequency of H in a population in Hardy-Weinburg equilibrium with genotypic frequencies of hh = 0.15, Hh = 0.48, and HH = 0.37, we can use the Hardy-Weinberg equation. 
We know that the frequency of the homozygous dominant (HH) plus half of the frequency of the heterozygous (Hh) will give us the frequency of the dominant allele H (p).
p (frequency of H) = frequency of HH + 1/2(frequency of Hh)
 = 0.37 + 1/2(0.48)
 = 0.37 + 0.24 
= 0.61. 
Thus, the allele frequency of the dominant allele H is 0.61.