The correct answer is D. All of the above.
A frequency distribution curve is a graphical representation of the distribution of data. It is a line graph that shows the frequency of each value in a data set. The frequency of a value is the number of times that value appears in the data set.
A frequency distribution curve can be unimodal, bimodal, or multimodal. A unimodal curve has a single peak, or lump. A bimodal curve has two peaks, and a multimodal curve has three or more peaks.
A frequency distribution curve can also be symmetrical or asymmetrical. A symmetrical curve is one that is the same on both sides of its center line. An asymmetrical curve is one that is not the same on both sides of its center line.
A symmetrical frequency distribution curve is called a normal curve. A normal curve is a bell-shaped curve that is the most common type of frequency distribution curve.
An asymmetrical frequency distribution curve is called a skew curve. There are two types of skew curves: positively skewed curves and negatively skewed curves. A positively skewed curve is one that has a longer tail on the right side of the curve. A negatively skewed curve is one that has a longer tail on the left side of the curve.
In conclusion, frequency distribution curves can be unimodal, bimodal, or multimodal; symmetrical or asymmetrical; and normal or skew.