Given : population mean (N) = 100 population stal dov ( 6) = 15 formula : x = pt ( Z * 6 ) P ( 2 7 ? ) = 0'65 Refer to standard normal table lZ table looking up for Z-score corresponding to area 0 65 to the right of the normal curve to find the I-score P LZ > - D : 39 ) = 6.65 2 = - 0:39 DX = 100 + ( - 0 39 x 16 ) = loot - 5:65 2 94:15 Rounded to one decimal place X = 94 . 2
