Ask Yield example, little

whew1110

I'm a little bit lost as to how to calculate Ask Yield, I tried googling to no avail.

So here is an example

http://online.wsj.com/mdc/public/page/2_3020-treasury.html#treasuryA

On here the June 2018 maturity Treasuries we see:

Maturity Coupon Bid Asked Chg Asked Yield
6/30/2018 2.375 101.8750 101.9219 0.9688 2.075


How is the last column determined?