Researchers at the Massachusetts General Hospital published in The New England Joumal of Medicine that the distribution of albumin levels in cerebrospinal fluid in symmetric with mean 29.5 mg/100 ml and standard deviation 9.25 mg/100 ml. in American adults. If a random sample of 30 adults is taken, what is the probability that the sample mean is at least 30 mg/100 ml? a. 0.5217 Ob. 0.3836 c. 0.4784 Od. 0.6164 Researchers at the Massachusetts General Hospital published in The New England Joumal of Medicine that the distribution of albumin levels in cerebrospinal fluid in symmetric with mean 29.5 mg/100 ml and standard deviation 9.25 mg/100 ml. in American adults. If a random sample of 30 adults is taken, what is the probability that the sample mean is at least 30 mg/100 ml? a. 0.5217 Ob. 0.3836 c. 0.4784 Od. 0.6164