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They had a 60% winning percentage with the 2nd toughest schedule. Even if the level of their play dropped, they could still maintain that winning percentage due to the competition being worse. Taking these factors into account, you could probably make a fair assumption that the confidence interval would skew higher Maybe something like 57%-67% winning percentage range is realistic considering the early success, the defensive first approach (typically s recipe to win consistently in the NBA), and the strength of schedule.