The dot plot for Class A shows the number of hours spent on a project by students, with data points at 1, 2, 3, 4, 5, 6, and 7 hours, and the frequencies as shown in the image. For Class B, each student spent twice the number of hours as a corresponding student in Class A. Which statement best compares the standard deviations of the number of hours spent on the project for Class A and Class B?
The standard deviation of Class A's hours is less than the standard deviation of Class B's hours.
The standard deviation of Class A's hours is equal to the standard deviation of Class B's hours.
The standard deviation of Class A's hours is greater than the standard deviation of Class B's hours.
There is not enough information to compare these standard deviations.
