Mailbox details like Mailbox total Size and Average size for users who all are part of the AD Group

Hello folks,

I am trying to fetch the users mailbox details / Mailbox statistics along with the average size from one of the AD Group but unable to  get that as the cmdlet is not recognized.So any idea how can i get that.

get-adgroupmember "Exchange Advanced Users Quota GG" | get-mailbox | get-mailboxstatistics | sort-object TotalItemsize -Descending | ft Displayname,@{ expression={$_.TotalItemSize.Value.ToMb()}},ItemCount

Looking for user mailbox details like Mailbox total Size and Average size for users who all are part of the AD Group

I can use the below cmds but that won't give me the user details from the AD group

Get-Mailbox -Resultsize Unlimited | Get-MailboxStatistics | %{$_.TotalItemSize.Value.ToMB()} | Measure-Object -Average

Pls help  Thanks