If those two are your only choices then the answer is none of the above.
<em>Attached is a cumulative frequency table for your data.</em>
If you take a look at the two tables given, the frequencies were not tallied properly. If the frequency column is wrong, then the cumulative frequency will be wrong. The answer is then none of the above or find one that matches the table attached.
To find the total area of the octagon you can find the area of the rectangle that is created by the entire figure and subtract the areas of the four congruent right triangles.
(10 cm x 6 cm) - [4(1/2 x 2 x 2)] 60 cm² -8 cm² = 52 cm²