No, it's 100W of panels per sq metre. 1/ 0.1 =10 - as long as you are just looking at panel area and not land area occupied.
Take a Kyocera 200W panel and you approach around 140W per sq metre. (At standard test conditions of 1000W/ sq m, 200W output from an array measuring 1425mm x 990mm
Who do you mean by people? Wh per day is a reasonable unit to use for non continuous power sources. kWh per annum is a reasonable unit for overall system output for comparison purposes.
Using the methods I outlined in my posting enables Met Office or NOAA insolation data to be rapidly inserted into the formulae and overall output per day or per annum to be evaluated. Bogging yourself down with kWh and kW when you have discontinuous supply, local battery storage and discontinuous use can lead to endless confusion, of course you need to know the loads,and the storage capacity but the power available is probably the most important figure to any off grid user.