Lena found a -carat diamond ring in the parking lot and turned it in to the police. Afterward, her friends discussed the weight of the diamond in terms of decimal numbers. Lena said it weighed 0.275 carats, but Sheldon thought it was closer to 0.58 carats. Naomi predicted the ring weighed 0.625 carats, but Mark disagreed and said 0.8 carats. Paula went with 0.875 carats. Who had the correct measurement?