If the random variable Z has a standard normal distribution, then P(1.17 ≤ Z ≤ 2.26) is: i got the z value for 1.17 is 0.8790 and the z value for 2.26 is 0.9811 and my answer is wrong which is 0.1021.the correct answer is 0.1091. Can you explain to my in details why? thank you so much.