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(d) Estimate th To estimate the probability that a person who comes into the store will buy nothing, again we use the formula, probability of event = relative frequency = -, where f is the frequency of the event occurrence in a sample of n observations. The event of interest is that a person who comes into the store will buy nothing. To estimate this probability, apply the formula. P(person who comes into the store will buy nothing) = number of people who buy nothing number of people who come into the store The probability can be estimated using the data John gathered. Yesterday he counted 138 people walking past the store, 65 of whom came into the store. Of the 65, only 28 bought something in the store. The frequency is the number of people who buy nothing. Since 65 people walk into the store, and 28 people buy something, the number of people that walk into the store and buy nothing is 65 - 28 = 3 m people. The number of observations is equal to the number of people who come into the store. Apply these values to the formula and round the final estimation to two decimal places. number of people who buy nothing P(person who come into the store will buy nothing) = number of people who come into the store 0.56 X