Question: Messages that arrive at a service center for an information systems manufacturer have been classified on the basis of the number of keywords (used to

Messages that arrive at a service center for an information systems manufacturer have been classified on the basis of the number of keywords (used to help route messages) and the type of message, either e-mail or voice. Also, 70% of the messages arrive via e-mail and the rest are voice.

Number of keywords E-mail Voice 1 4 3 0.2 0.1 0.2 0.4 0.1 0.3 0.2 0.4 0.1 2.

Determine the probability mass function of the number of keywords in a message.

Number of keywords E-mail Voice 1 4 3 0.2 0.1 0.2 0.4 0.1 0.3 0.2 0.4 0.1 2.

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