Some studies suggest a beta-carotene intake over 3000 mcg, Ask an Expert

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Beta-carotene is hypothesised to prevent macular degeneration, an important eye disease in the elderly. A dietary survey was undertaken to measure beta-carotene intake in the typical diet. Assume the distribution of beta carotene intake is Normally distributed with a mean of 2258 mcg and standard deviation of 824 mcg (note: mcg=micrograms).

What percentage of people have a dietary beta-carotene intake below 600 mcg?

According to the US Institute of Medicine, the intake of between 900 mcg and 2775 mcg of beta carotene will keep the blood level within the range associated with a lower risk for chronic diseases. What percentage of people has a dietary beta-carotene intake between these ?two values?

Some studies suggest a beta-carotene intake over 3000 mcg may protect against ?macular degeneration. What percentage of people has a dietary beta-carotene intake of at least ?3000 mcg?

What are the amounts of beta-carotene intake that encompass the middle 90% of the ?distribution?

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