High use of RAM

I note when using Yosemite (by the Activity Monitor) a very high use of RAM when I don't even have any chosen apps running. Why?

Hello Allan,
Many thanks for your response. I tried a few ways of copying to your response but this was the only way it seemed to work.
EtreCheck version: 2.1.8 (121)
Report generated 5 March 2015 15:05:22 GMT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    iMac (27-inch, Late 2012) (Technical Specifications)
    iMac - model: iMac13,2
    1 3.2 GHz Intel Core i5 CPU: 4-core
    12 GB RAM Upgradeable
        BANK 0/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 0/DIMM1
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM1
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
    NVIDIA GeForce GTX 675MX - VRAM: 1024 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 2:44:37
Disk Information: ℹ️
    APPLE HDD WDC WD10EALX-408EA0 disk0 : (1 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 999.35 GB (534.90 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
    Saitek Pro Flight Cessna Trim Wheel
    Saitek Saitek Pro Flight Yoke
    CH PRODUCTS CH PRO PEDALS USB
    Apple Inc. FaceTime HD Camera (Built-in)
    Generic External 6.98 GB
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Library/Extensions
    [loaded]    com.sophos.kext.sav (9.2.50 - SDK 10.8) [Click for support]
    [loaded]    com.sophos.nke.swi (9.2.50 - SDK 10.8) [Click for support]
Launch Agents: ℹ️
    [running]    com.sophos.uiserver.plist [Click for support]
    [running]    com.trusteer.rapport.rapportd.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.audirvana.Audirvana-Plus.plist [Click for support]
    [running]    com.freemacsoft.appcleanerd.plist [Click for support]
    [loaded]    com.macpaw.CleanMyMac2.Agent.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [running]    com.sophos.common.servicemanager.plist [Click for support]
    [running]    com.trusteer.rooks.rooksd.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [loaded]    com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist [Click for support]
    [loaded]    com.macpaw.CleanMyMac2Helper.scheduledScan.plist [Click for support]
    [loaded]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
    Default Browser: Version: 600 - SDK 10.10
Safari Extensions: ℹ️
    Slick Savings [Adware! - Remove]
    Searchme [Adware! - Remove]
    Bing Highlights
    Amazon Shopping Assistant [Adware! - Remove]
    Ebay Shopping Assistant [Adware! - Remove]
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
    Trusteer Endpoint Protection  [Click for support]
Time Machine: ℹ️
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 999.35 GB Disk used: 464.45 GB
    Destinations:
        OS_Install [Local]
        Total size: 499.76 GB
        Total number of backups: 5
        Oldest backup: 2014-11-23 20:48:20 +0000
        Last backup: 2015-01-26 16:02:52 +0000
        Size of backup disk: Too small
            Backup size 499.76 GB < (Disk used 464.45 GB X 3)
Top Processes by CPU: ℹ️
         4%    mds
         2%    WindowServer
         0%    fontd
         0%    sysmond
         0%    SystemUIServer
Top Processes by Memory: ℹ️
    232 MB    SophosScanD
    206 MB    InterCheck
    180 MB    com.apple.WebKit.WebContent
    168 MB    Safari
    116 MB    Mail
Virtual Memory Information: ℹ️
    5.13 GB    Free RAM
    3.57 GB    Active RAM
    2.80 GB    Inactive RAM
    1.38 GB    Wired RAM
    4.09 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Mar 5, 2015, 01:34:58 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/X-Plane_2015-03-05-133458_[red acted].crash
    Mar 5, 2015, 12:19:04 PM    Self test - passed

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    EtreCheck version: 2.0.11 (98)
    Report generated November 23, 2014 at 5:57:30 EST
    Hardware Information: ℹ️
      Mac mini (Mid 2010) (Verified)
      Mac mini - model: Macmini4,1
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      1.87 GB Page-ins
      6 MB Page-outs

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    SO if I may ask one other question separate from the above.
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