From the z-table:

(a) Area = `0.2823`

240-2-4z0.78Open image in a new page

Portion of standard normal curve 0 < z < 0.78.

(b) Area = `0.2123`

240-2-4z-0.56Open image in a new page

Portion of standard normal curve −0.56 < z < 0.

(c) Area = `0.1664 + 0.2823 = 0.4487`

240-2-4z-0.430.78Open image in a new page

Portion of standard normal curve −0.43 < z < 0.78.

(d) Area = `0.4332 - 0.1700 = 0.2632`

240-2-4z0.441.5Open image in a new page

Portion of standard normal curve 0.44 < z < 1.5.

(e) Area = `0.4082 + 0.5 = 0.9082`

240-2-4z-1.33Open image in a new page

Portion of standard normal curve z > −1.33.

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