1: Normal distributions are symmetrical about the mean.

3: Only 5% of the area under the curve lies to the left of `z`, and the rest of it lies to the right.

5: Find the `z` scores, shade between them, and find the shaded area by getting the areas from the table and subtracting.

14: See below the table for `z` values that are off the chart (like `z` ＝ 4 in this case).

16: Convert 5.2% to a decimal so you can find it inside the table.

19: Look up the complement of 8% to find the area above 8%.

23: The middle 98% of the curve is 49% below the middle and 49% above the middle.

29: For (a), find the percentage for `x` ＝ 36 months (see 6-B), and for (b), find the number of months `x` for the bottom 10% (see 6-C).

36: Convert 7200 and 8900 to `z` scores so you can look up their percentages.