To answer this probability question, first convert the score of 160 into a z-score, then check that z-score against a normal curve table to find the area (i.e., the probability). z-score is a unit of measure that expresses an original score in terms of the standard deviation. z-scores always have a value of 0 for the mean and a value of 1 for the standard deviation. To convert an original score into a z-score, you must first subtract the value of the mean from the value of the score. Next, divide the difference by the value of the standard deviation. The result is the z-score. The normal curve has been so thoroughly explored and described that a standardized table can be used to easily look up the area between and beyond any given z-score along with its mean value. Next, you would like to determine the probability that a person will get a score of less than 160. What should you do to determine that probability? option 1: find the area below the score of 160 and add 5000 or find the area below the score of 160 and multiply it by 100