ARE MAC COMPUTERS PRE-INSTALLED WITH ANTIVIRUS SOFTWARE?

They come with a FireWall that you can need to activate (in system preferences- security).

There are also no viruses for mac in the wild. There are a small amount of Trojans, but provided your careful and also not doing things that you are not supposed to, you will not need to worry about them. The latest one is mac defender found on google images. If you are there and it redirects you to a weird page that claims that you have viruses and is from "Apple Security Center" go into your apple option and force quit your browser.

You can still, if you absolutely want to (although do not need to) you can install anti-malware protection from a reputable source (do not trust "free" things that look like the real thing)

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Since Mac's are now in the bad guys crosshairs , adopting good security strategies (adopted from years of malware infestations in tens of millions of PC users) must now be employed by Mac's: and that means concentrating efforts on PREVENTION. Not removal.
Poisoned JavaScript is delivered to the browser, (none are immune), and this powerful language then manipulates a computer and installs these "rogue" items.
Firefox, with "NoScript" controls what automatically deploys from the browser, and is the #1 defense against several vectors of malware.
https://addons.mozilla.org/en-US/firefox/collections/dunbar-pappy/dunbarpappy/

Also, the default configuration for Safari has "Open "safe" files after downloading" checked (by default). This setting is under "Preferences" in Safari and is at the bottom of the "General" tab (the first tab).
It must now be disabled (unchecked) at all times.

And, do not rely on "signature" based antivirus. Criminals update their rubbish daily (just like the good guys) and change names and other aspects (like a fingerprint) in order to get around detection.
Prevention: not removal.

Mac computers don't really need antivirus software but there is some freeware just in case. I've owned macs for 12 years - no viruses or spyware.

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No, they're not. You must install an antivirus program yourself. There are a few free anti-viruses for the Mac, such as Sophos Anti-Virus for Mac Home Edition.

you've no need to install antivirus in mac because hackers makes viruses and threat for windows not for mac(snow lapeord).