Which isotope is least likely to be stable?
A) Ca-40
B) Cl-38
C) U-235
D) Xe-136

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The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked