While there is much debate, several health authorities have concluded that a vitamin D level of 30 is adequate for maintaining one's health. Suppose this is the mean vitamin D level for adults in the United States. What is the probability that random sample of 15 adults from the United States will have a mean vitamin D level below 25? Suppose the standard deviation is 6.
None of these
0.3812
Cannot be solved since the sampling distribution cannot be established.
0.4207
0.0006
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