5.8 Trapezoidal rule Quiz

1. Seven equally spaced readings are used in the trapezoidal rule. How many trapezoids are there?

• A. 7
• B. 5
• C. 6
• D. 12

2. The values 3, 5, 6, 4 are spaced $h=2$ apart. What is the trapezoidal estimate?

• A. $29$
• B. $14.5$
• C. $58$
• D. $36$

3. Which statement about the trapezoidal rule is correct?

• A. Interior values are counted once
• B. It always gives an under-estimate
• C. It needs strips of unequal width
• D. It joins the points with straight line segments

4. A curve is concave up between the points used. The trapezoidal estimate is:

• A. an under-estimate
• B. an over-estimate
• C. exact
• D. impossible to say

5. A reading of 8.4 is rounded to 1 decimal place. What is its lower bound?

• A. 8.35
• B. 8.4
• C. 8.45
• D. 8.3