Question for you

It's confession time. I'm rubbish at maths. I took it 5 times at O level and failed every time.

Now, hundreds of years later, I've been lured into studying GCSE Statistics. I've done my coursework and am on track for some kind of pass grade.

The exam is looming large. It's on 24th June which means I'll miss 2/3 days of the Glastonbury Festival.

What's the probability that this is a good decision because the fields of Worthy Farm will be experiencing biblical weather? To 3 s.f please.