100 people polled = 100 polls = 100%
73 new in 100 polls = 73% new
36 upgrades in 100 polls = 36% upgrades
Surprise, surprise, the numbers do add up
You just have to read such summary type of data correctly.
And the numbers don't really mean much anyway - it's just data for statisticians to mull over. No company is going to change its upgrade plans because the majority of other companies have different plans; it will (hopefully) follow the plan that best fits its own needs. And I doubt any individual is going to change his or her plans because major corporations have other plans.
On the other hand, the results of polls like this might influence oem support teams to get moving and get familiar with Windows 10 so they can provide assistance when assistance is needed. Even if they don't have an obligation to provide help for an upgrade, they will eventually be selling hardware with Win10 pre-installed. Providing help with upgrades might just be good training for them.
Surfing the net, I note that Windows 10 Enterprise comes with the mature Internet Explorer and not with the (currently) immature Edge of Windows 10 Home and Windows 10 Pro. I would think that at some point in the hopefully not too distant future, a mature Edge will come to Windows 10 Enterprise as well. This is when Windows 10 Home and Windows 10 Pro get an enterprise grade browser, methinks.
I realize that you can launch Internet Explorer in Windows 10 Home and Windows 10 Pro, because Edge is not fully featured yet. When will Edge be fully featured? My best guess at the moment is: when Edge will be made available to Windows 10 Enterprise. At that point in time, Windows 10 passes another milestone towards being ready for 'work', all IMHO of course.
I think that milestone can adequately be reached and passed by installing Firefox.
Firefox is not Windows 10. Not even Internet Explorer is Windows 10. Edge is Windows 10.
Edge is thus a measuring stick (of many) for gauging Windows 10 readiness for 'work'.
Another measuring stick is those polling stats discussed further up, BTW.
They are very well meaningful, if you read them correctly.