ping
justin@Justin:~$ ping 10.194.45.254
PING 10.194.45.254 (10.194.45.254) 56(84) bytes of data.
64 bytes from 10.194.45.254: icmp_seq=1 ttl=64 time=1.45 ms
64 bytes from 10.194.45.254: icmp_seq=2 ttl=64 time=1.12 ms
^C
--- 10.194.45.254 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 1.120/1.287/1.455/0.171 ms

mdev = ((x1 - _x) + (x2 - _x) )/ 2

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