Input multiple data into one input field (VBA)

I have a user form which allows the input of test results quickly.

One box is for a percentage result. If "60.23" is typed in, it will divide this by 100 and then input that into a cell in a work sheet to give 60.23%.

Is it possible for it to do this, but also allow the user to type in:
"60.1, 62.4, 59.5"

So it will scan all three values, calculate an average and then divide by 100, and input into a cell?
Mainly in the interest of saving space, I'd rather do this in one box rather than making three separate boxes

Try this

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That works a treat. Thanks!

Follow up question:

How do I turn this into a separate function? I've tried:

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But it doesn't like the use of the string z as a qualifier.

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