Ch. 6.1 #7-49 odd

Since the z score is on the left side of 0, use the negative z table. Areas in the negative z
table are in the tail, so we will use 0.5 - 0.4175 = 0.0825 as the area. The closest z score corresponding to an area of
0.0825 is z=- 1.39.
43)
Z=- 2.08, found by using the negative z table.
45)
Use the negative z table and 1 - 0.8962 = 0.1038 for the area. The z score is z= -1.26.
47) Find the z values to the left of the mean so that
a) 98.87% of the area under the distribution curve lies to the right of it.
Using the negative z table, area = 1 - 0.9887 = 0.0113. Hence Z=- 2.28.
b) 82.12% of the area under the distribution curve lies to the right of it.
Using the negative z table, area = 1 – 0.8212 = 0.1788. Hence Z=- 0.92.