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Calculating the common-scale rating: We divided the adjusted T-Score, which is on a 100-point scale, by 20 to convert the third-party rating to a common 0-5 point system.

To ensure that the mean was equal across all data points, we added our desired scoring mean (between 0 and 10) to the T-Score to create an adjusted T-Score.

Calculating the T-Score: We used a T-Score calculation to convert the Z-Score to a 0-100 scale by multiplying the Z-Score by 10.

(Opens in a new window) 32.99 for 3-Devices on 1-Year Plan (List Price 84.99) Norton AntiVirus Plus. We then subtracted the mean from the company’s rating and divided it by the standard deviation to produce the Z-Score. The Best Mac Antivirus Protection Deals This Week. The Z-Score is negative when the data point is below the mean and positive when it's above the mean a Z-Score of 0 means it's equal to the mean.To determine the Z-Score for each third-party rating of a company, we calculated the mean of the ratings across all companies evaluated by that third-party source.

Avast One comes with many advantages: Put adware in its place You have to deal with enough ads, so get rid of malicious adware on your PC permanently with Avast. Calculating the Z-Score: The Z-Score represents a data point's relation to the mean measurement of the data set. Our best free adware scanner and adware removal tool Avast finds and deletes adware and viruses faster and more thoroughly than any other adware scanner and cleaner on the market.There are also other types of threat, such as ransomware and other phishing attempts, where an attempt is made to extract information that can be used to obtain money from you. Malware tends to take the form of apps that pretend to do one thing, but actually do something nefarious, such as steal data. We also recommend you read our best Mac security tips and our roundup of the best Mac antivirus apps, in which we recommend Intego as our top choice.). Download our free spyware cleaner Avast One scans, finds, and removes spyware, blocks future spyware infections, and guards against viruses, ransomware, and other threats. There are lots of nasty people out there who see Macs - and their users - as prime targets, and in this article we show how to stay safe and avoid or get rid of the malware and viruses they try to dump on your Mac. Avast’s Mac antivirus software automatically detects and removes spyware from your Mac while defending against other types of malware like viruses and ransomware, too. One is the stringent protections built into macOS, another is the fact that it is exceptionally difficult for a virus to propagate itself and spread to other Macs. In fact, since the release of OS X (now known as macOS), a tiny fraction of the total number of Macs in the world have ever been infected. For severe infection, you need licensed antivirus software tools.

While this is true of devices based on iOS - such as the iPhone or iPad - its not 100 percent true when it comes to Macs nowadays. They can protect you at the basic level, but in case of some severe malware infection, these free tools can’t serve you.