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A survey of U.S. adults found that 69% of those who text on cell phones receive spam or unwanted messages. You randomly select 100 U.S. adults who text on cell phones. Find the probability that the number who receive spam or unwanted messages is
(a) Exactly 70,
(b) At least 70,
(c) Fewer than 70,
(d) Identify any unusual events.
Explain. |
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