Using the standard normal z random variable the probability statement P 60 x 85 is now P 2 z 0 75 so the normal probability table can be used The area to the left of 2 is Select than the area to the left of 0 75 Therefore the probability of P 2 z 0 75 will be calculated as Select The area under the curve to the left of z 2 was found to be 0 0228 Use the table excerpt below to find the area under the curve to the left of z 0 75 P Z 0 75 to four decim places 0 00 0 2119 0 2420 0 2743 Z 0 8 0 7 0 6 P Z 0 75 0 01 0 2090 0 2389 0 2709 0 02 0 2061 0 2358 0 2676 0 06 0 07 0 08 1949 0 1922 0 1894 0 05 0 1977 0 2266 0 2236 0 2206 0 2177 0 2578 0 2483 0 2546 0 2514 0 03 0 2033 0 04 0 2005 0 2296 0 2327 0 2611 0 2643 0 09 0 1867 0 2148 0 2451