Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15 hours. Together they charged a total of $2350. What was the rate charged per hour by each mechanic if the sum of the two rates was $185 per hour?

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.