Analysis: By the definition of Percentile, Pos means locating an area before or below the point. STEPS SOLUTION 1. Draw the appropriate normal curve. 2. Express the given percentage as probability 95% means 0.9500 3. Split 0.9500 into 0.500and 0.4500 0.9500 = 0.5000 + 0.4500 4. Refer to the z-table and locate the area 0.4500 in the This area is not found in the table. It is between the body of the table. values 0.4495 and 0.45505. 5. Since 0.4500 is 0.005 unit below and above, we take the average of their corresponding z-values. z=1.64 and 2 = 1.64+1.65 2 = 1.645 z=1.65 6. Locate z= 1.645 under the curve in step 1 and make a The 95th percentile is z= 1.645 statement. Your TRY! Directions: Find each of the following percentile points under the normal curve. Complete your procedures. 1. Poo 2. Poo 3. P30