Double barring vs barring

[TheOddOneOut]

I know it's an old post, but it got me, so trying to get an answer for below-thank you:

I have 3 cuckoo marans pullets, they are bound to start laying soon. From the above, they are single barred. Does it mean that if I mate them with my Langshan roo that we are likely to get pullets? I'm really tired of getting roos!

No matter what color the birds are, the odds of 50/50 stay the same :/