00 equals 1.60) to find that the cumulative probability for z = 1.60 is 0.9452, the same value we got earlier as the cumulative probability for speed = 73 mph. We look in the ".00" column of the "1.6" row (1.6 plus. In our vehicle speed example, the standardized scores for 73 mph is Here, probability speed less than or equal 73 mph = probability z-score less than or equal 1.60. The cumulative probability for a value equals the cumulative probability for that value's z-score. The column labels give the second decimal place of the z-score. Row labels of Table A.1 give possible z-scores up to one decimal place.A standardized score (also called z-score) is \(z=\frac\).Table A.1 in the textbook gives normal curve cumulative probabilities for standardized scores. Using the Standard Normal Table in the appendix of textbook or see a copy at Standard Normal Table
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