Serum vitamin E levels for adults are normally distributed mean = 900mg/dL and standard deviation = 350mg/dL.

a. Iflevels above 1,600mg/dL are considered nearly toxic, the percentage of adults having toxic levels is ___________

b. 10% percent of adults have serum vitamin E levels above _____ mg/dL.

c.The middle 60% of adults have serum vitamin E levels are between __mg/dL and __mg/dL