Thus, a genotype's frequency will decline or increase depending on whether its fitness is lower or greater than the mean fitness, respectively. In the particular case that there are only two genotypes of interest (e.g. representing the invasion of a new mutant allele), the change in genotype frequencies is often written in a different form.
1 Places such as Lowes and Home Depot will charge around $60 per day. 2  According to DoItYourself.com, they claim that average daily rental is going to be around $60 per day. 3  They also note that a good pressure washer should cost you around $350. 4  SunbeltRentals.com offers a variety of pressure washers.
I'm in the market for a pressure washer and I've been checking some out at Sears, Lowes, Home Depot, etc. I've seen PSI ratings from 1,600 to 3,000. I plan to use a pressure washer to clean my bikes, cars, driveway, deck and house. How many PSI do I need for my planned usage? I don't want to pay $300+ for a pressure washer that puts out enough PSI to cut steel if you know what I mean.