EXAMPLE 29Case 2: Find the area to the right of a value of
Find the area to the right of .
Solution
- Step 1 First draw the standard normal curve and label .
Step 2 Shade the area to the right of − 1.25, as shown in Figure 30.
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Figure 6.32: FIGURE 30 Finding the area to the right of .Step 3 In the table, excerpted in Figure 31, go down the left-hand column to − 1.2 and select that row. Then go across the top row to 0.05 and select that column. The area to the left of is therefore 0.1056. From Case 2 in Table 8, the area to the right of −1.25 is then
Remember that, although values of can be negative, probabilities (or areas) can never be negative.
NOW YOU CAN DO
Exercises 45–48.