(Solved) Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights).
Question: Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights). A random sample of 30 of the elements which do have isotopes showed a mean number of $19.63$ isotopes per element and the population a standard deviation of $18.73$. Estimate the true mean number of isotopes for all elements with isotopes with \(90 \%\) confidence.
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