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 email or voice. Also, 70% of the messages arrive via email and the rest are voice.
number of keywords | 0 | 1 | 2 | 3 | 4 |
0.1 | 0.1 | 0.2 | 0.4 | 0.2 | |
voice | 0.3 | 0.4 | 0.2 | 0.1 | 0 |
Determine the probability mass function of the number of keywords in a message.
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