Estimate statistics from grouped data. Organize data, calculate midpoint (x), fx, x2, fx2, and cumulative frequency (cf).

Here's how to estimate the requested statistics from the given grouped data:

First, we organize the data and calculate the midpoint ($x$) for each class interval, the product of frequency and midpoint ($fx$), the square of the midpoint ($x^2$), the product of frequency and squared midpoint ($fx^2$), and the cumulative frequency ($cf$).

Class Interval	Frequency (f)	Midpoint (x)	$fx$	$x^2$	$fx^2$	Cumulative Frequency (cf)
2-6	4	4	16	16	64	4