A microbiologist is estimating the total number of bacteria in a petri dish. They take 5 samples from different sections of the dish. The initial counts from these samples are 120, 135, 110, 125, and 200. The entire petri dish has an area equivalent to 100 such sample sections.

Based on the mean of the initial sample, what is the estimated total number of bacteria? If the sample count of 200 was later found to be an error and should have been 130, by how much would the estimated total number of bacteria change?