Here's the article PDF which includes the graph (Figure 1):https://www.google.com/url?url=http://scholar.google.com/scholar_url%3Furl%3Dhttps://brage.bibsys.no/xmlui/bitstream/handle/11250/277366/R%2525F8ysamb_2014_The.pdf%253Fsequence%253D3%26hl%3Den%26sa%3DX%26scisig%3DAAGBfm2Hxu13P6zE1CQGJHMxAdBvIb0xgA%26nossl%3D1%26oi%3Dscholarr&rct=j&q=&esrc=s&sa=X&ved=0ahUKEwje0JLlsZjVAhVm5YMKHbz0CLsQgAMIJigAMAA&usg=AFQjCNG6KpKYZ7RYmjmP6TjzEmltruTHvQ&cad=rja

Would appreciate any suggestions on how to derive a formula from the data points given in the graph that can be used to get Y when a new X (score) is known.

Thank you.

Best Wishes,