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hi in this video I will demonstrate how to compute cut off scores for an application of the normal distribution using a ti84 plus calculator we begin with the following problem it states the average cost of a used 2019 Camaro is around $35,000 with a standard deviation of $1,200 what is the range your prices for the middle 30% of used Camaros whenever we see the middle 30% that means we divide 30% by two to compute 15% we put 15% to the left and 15% to the right of the mean under the normal distribution the value at the edge is is the lower cff score which Iamp;#39;ve labeled XL the value on the right side is the upper cutoff score which Iamp;#39;ve labeled X mu the mean is 35,000 standard deviation 1,200 we want to use the ti84 plus to help us calculate these two cutof scores first we need to find this left tail area to find this left tail area keep in mind that the entire area to the left of the mean is 0.5 so we compute 0.5 minus 0.15 and we calculate .35 this area is 35 w
