Fatima conducted an experiment where she asked people to estimate the temperature of glasses of water. she recorded how far the estimates were from the actual temperatures, using positive values for guesses that were too high and negative values for guesses that were too low. her results are in the table below.

what is the mean value in fatima's results in degrees celcius?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?