(Please help my test is timed.) The amount of time, t, Tom needed to mow the grass in his neighborhood is directly proportional to the amount of lawns, I, (all the same size) and inversely as the number of friends, f , who helped Tom. If it takes Tom and one friend 5 hours to mow 10 lawns, how long will it take Tom and 3 friends to mow 24 lawns?

How do you summarize data in a two-way frequency table?

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.