6.Assume that male weights are normally distributed with a national average of 165.7 lbs. The probability of an individual chosen at random having a weight of greater than 190 lbs. is 25%.The probability that the mean weight of a sample of 40 men being greater than 190 lbs. is 2%.This rather large difference is due to the fact that

A.Standard deviation of samples is larger than the standard deviation of the population

B.The distribution of sample means is less variable than the distribution of individual data

C.Sampling error may have occurred during the research

D.The mean of the sample means varies from the population mean