Can you please help me understand how the answer arrived at .975 for the area under the curve in reference to the follwing question? The solution in Bartleby mentions that the cummulative area is .975...

Can you please help me understand how the answer arrived at .975 for the area under the curve in reference to the follwing question? The solution in Bartleby mentions that the cummulative area is .975 to the left and I don't understand where that value come from.

Books: MYLAB ELEMENTARY STATISTICS, Larson, Publisher: INTER PEAR, ISBN: 9780136797173

1TY question 2

Question: Find the positive z-score for which 95% of the distribution's area lies between -z and z.