Question: The element titanium has five stable occurring isotopes, differing from each other in the number of neutrons an atom contains. If X is the number

The element titanium has five stable occurring isotopes, differing from each other in the number of neutrons an atom contains. If X is the number of neutrons in a randomly chosen titanium atom, the probability mass function of X is given as follows:

x 24 25 26 27 28 p(x) 0.0825 0.0744 0.7372 0.0541 0.0518

a. Find ????X.

b. Find ????X.

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