I've been working on these two questions for a while. The wording is throwing me off, and I'm struggling to work through the problems. Thx so much!

I've been working on these two questions for a while. The wording is throwing me off, and I'm struggling to work through the problems. Thx so much!

A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded for each household in the sample for the March quarter of 2006. The average usage was found to be 375kWh.