What is the missing information to find the value of ‘x’?

[rebo1984]

Emily and Ashli each collected six rocks, and the masses of the rocks
are shown in the table below. The mean of the masses of the rocks
Ashli collected is 0.2 kilogram greater than the mean of the masses
of the rocks Emily collected. What is the value of ‘x’ ?

 

[MarkFL]

I have moved your post to its own thread, as this is a better fit than in an announcement regarding the anniversary of our founding. ;)

It seems some information is missing...