Data Distribution

Let us mark ten student heights on the number line. one hundred thirty-eight. one hundred forty-two. one hundred forty-five. one hundred forty-two. one hundred fifty. one hundred thirty-eight.

one hundred forty-five. one hundred forty-eight. one hundred forty-two. one hundred forty-five. This is the smallest height. This is the tallest height. From smallest to tallest, this is the range.

These two heights appear most often. More in the middle, fewer at the ends. Let us mark eight test scores on the number line. eighty-five. ninety. eighty-five. ninety-five. eighty-five. ninety.

eighty-eight. ninety-two. This is the smallest score. This is the tallest score. From smallest to tallest, this is the range. This score appears most often.

These are the weekly reading hours of twelve students. How many data points were collected? Twelve data points. What is the range of reading time? From one to seven.

What is the most frequent reading time? Four hours. How many students read more than four hours? Four students. Here are three dot plots. Watch their distribution shapes.

Look at their distribution shapes. Here is the dot plot for these twelve numbers. What is the range of the data? From three to seven. Which value appears most often? Five.

These are the weekly TV watching hours of a class. What is the most common TV watching time? Three and four hours. How many hours does the most active student watch? Eight hours.

If you watch five hours, is that more than most students? Yes, more than most students.