In the Marines a common way to address a group would be to use the word ‘people’. As in, good morning, people.
Which of these greetings is best when addressing a group of people both female and male —
Good morning, guys?
Good morning, people?
Good morning, y’all?
Good morning, youz guyz?
Other?
Trying to be politically correct, polite, and professional…
Good Morning, Everybody.
ETA: or, simply, Good Morning.
I say “good morning folks.”
Try “everyone”.
I often call my students “folks”. As in “Good morning, folks.” Sometimes I call them “party people” and demand they raise the roof. Sometimes they actually do raise the roof.
If you’re going for polite and professional (and I’m not biting the “politically correct” bait), the best option from your list is “people” and it’s not even a contest. “y’all” comes a very distant second.
Folks. Everyone. Gentlepeople. Y’all.
I try and avoid gendered terms like boys, guys, etc. when addressing a group.
I’m more interested in the following sentence. Did the bus stop with a jerk? 
Do avoid “What’s up, motherfuckers?” in an office setting. One crazy guy told me he was fired for just that.
I usually stick with “folks” instead of “guys”.
In the past I’ve discussed this in the context of “guys” and “ladies.” I see no problem w/ either, but some people do. So my longtime default now is to simply say, “Good morning.” No real reason/need to use any term that might be interpreted in a way you did not intend. No reason to specify that you are greeting EVERYONE - unless you want to say, “Good morning - except you, Eric. I wish you’d die.”
I think the right greeting really depends on the degree of formality that exists in the setting, and to some extent the degree of formality you’re trying to project. All of the suggestions here work in the right circumstances. “Good morning, everyone” is fine in many business settings, but it tends to project a bit of formality, the kind of greeting you might expect from a senior manager addressing a large group. It’s just a few notches down from “ladies and gentlemen”. “Folks” is, well, more folksy.
But there’s really nothing wrong with “good morning, guys” or just “hi, guys” to a mixed group if you know everyone well and they know you and there’s no possibility that anyone could think you’re trying to ignore or minimize the females in the group. I hear it used this way all the time and have used it that way myself.
For another example, there are a bunch of aviation videos I’ve been watching by a very likeable guy who is a passenger airline pilot, an instructor, and a certified examiner – i.e. by nature and by necessity very much a sociable “people person”. He begins all his videos with “Hi, guys!”. And not because he assumes pilots are all males. He’s had women pilots in his videos, and effusively praised women pilots who have handled emergencies exceptionally well. He uses the greeting because it sets up the kind of informal rapport that he wants to establish with his audience.
“Wake up, you pukes! Drop and give me twenty!”
I learned all of my management techniques from Full Metal Jacket and Aliens. My employees love me!
Stranger
I’ve always used “guys” so that’s what I still use. It’s gender neutral to me. And I’m female. I’m not insulted even if “guys” is addressed to an all female group.
I’m on record saying I am willing to replace words if I find more than idiosyncratic offense being taken. But I have never run into anyone who was offended by using “guys” as non-gendered. I note Amber Ruffin, who says “lame” is ableist, still constantly refer to her audience as “guys.”
I have run into someone not liking that I used a gender neutral singular “guy,” but she was a trans woman who was sensitive to possible misgendering. I thus halted and started reversing my shift to making it more gender neutral.
But I’ve used phrases like “you guys” forever, and never once run into any problems. It would actually take a long time to fix, as it is what I use by default for the second person plural (rather than “y’all”). In fact, that’s why I believe Ruffin uses it.
I’m male. I’ve encountered enough women (not all) who object to “guys”, and others (not all) who object to “ladies.” So I eschew any such term.
That’s why I use, “Good morning, fuck faces!” Completely gender neutral. Rude, honestly expressed and gender neutral.
I hope you’re aware of how fortunate you are that actual Fuck Faces don’t have a lobbying arm … yet.
Just don’t say “guys and gals” - EVER!!! < shudder >
Same here (except I’m not female.)
If I’m saying “guys” then I know the people reasonably well. Well enough to know whether they’re likely to object. I call my daughters “guys” and they refer to people as “guys”.
Oh, thank you so much for putting Sarah Palin’s voice in my head.
Personally, I don’t care. : ) But I’m not everyone. (and I’m a she/her). I like People, Folx, Everyone… I try to be aware of saying “guys” because I know it’s a default for me and gendered terms have been a real thing of contention in my world. I’m not too proud to be awkward. Something else I’ve learned: sometimes “Hi, there!” or Y’all can suffice.
