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Probability of a person keeping in touch with his or her parents
Please show the formula, and the steps in working the formula, to solve problems.
In a poll conducted in 2007, 2000 adults ages 18 yr and older were asked how frequently they are in touch with their parents by phone. The results of the poll are as follows:
Answer Respondents (%)Monthly 11Weekly 47Daily 32Do not know 2Less 8
If a person who participated in the poll is selected at random, what is the probability that the person said he or she kept in touch with his or her parents
a. Once a week?b. At least once a week?
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