Suppose that 14 inches of the wire cost 42 cent. At the same rate, how much ( in cent) will 7 inches, of wire cost
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Empirical probability is computed by running an experiment multiple times (in this case, asking the same question to many people), and then computing the ratio
In this case, 236 people over 991 said that they checked the portfolio daily, so the empirical probability is
Which you can round as 0.238, i.e. 23.8%.