The survival times of guinea pigs inoculated with an infectious viral strain vary from animal to animal. The distribution of survival times is strongly skewed to the right. The central limit theorem says that

a) as we study more an more infected guinea pigs, their average survival time gets ever closer to the mean µ for all guinea pigs.
b) the average survival time of a large number of infected guinea pigs has a distribution of the same shape (strongly skewed) as the distribution for individual infected guinea pigs.
c) the average survival time of a large number of infected guinea pigs has a distribution that is close to Normal.
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