[HairOfTheDog]

2.7 billion times by at least 270 million unique computers, leading to the removal of 16 million instances of malicious software from 5.7 million unique Windows-based computers over the past 15 months

270,000,000 / 5,700,000 = 2.11%

2,700,000,000 / 16,000,000 = 0.59%

Sixty-two percent of those computers had Trojan horse programs on them.

Oh - so he does know how to do percentages... why that one, and not the others?

[Michael Barnes]

MS is teh sux0r

WTF, might as well kick it off early.. ;-)

/suse user

[Swordmaker]

Oh - so he does know how to do percentages... why that one, and not the others?

Ask if Microsoft can do percentages.

The 270,000,000 is the population... 5,700,000 is the sample. 16,000,000 is the number of discrete instances of malware found on the sample.

A legitimate question that should be asked is: "Can the results found in the sample be extrapolated to the general population?"

If it can, then we can extrapolate that 167,400,000 of those 270,000,000 computers were infected with at least one Trojan during the past 15 months.

So, is Microsoft's sample valid?