Find the area under the standard normal curve between z = - 2.57 and z = 1.27. Round your answer to four decimal places, if necessary.

P (-2.57 ≤ Z ≤ 1.27) = P (Z ≤ 1.27) - P (Z ≤ - 2.57)

P (Z ≤ 1.27) = 0.8980

P (Z ≤ - 2.57) = 1 - P (Z ≤ 2.57) = 1 - 0.99488 = 0.00512

P (-2.57 ≤ Z ≤ 1.27) = 0.8980 - 0.00512 = 0.89288

0.8929 (4 d. p.)