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Hi Alex,

I think you are confusing tilt and recline. Tilt tips the whole chair without changing the seat-to-back angle (think of sitting in a dining room chair and leaning back so the front legs come off the floor). Recline opens up the seat-to-back angle (think of a recliner).

In a normal distribution, 95.4% of scores fall within 2 standard deviations of the mean, but that is not exactly what the question was asking. The question asked what percentage scored below 112 (2 standard deviations above the mean) – not what percentage of patients scored between 88 and 112. You know that 100% of patients to the left of the mean scored under 112.