wn_data_mean

	status.i4.v = wn_data_mean(x_mean.r4.r, y_mean.r4.r)

	This routine calculates the mean values for the saved data set
	of the active graphic window.

	x_mean		mean x value
	y_mean		mean y value

	This function returns ACNET status values as follows:

	OK			success
	CBS_NOSETUP		an active window has not been established
				or no data has been saved
	CBS_NODAT		no valid data points for this request

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_data_save(_c), wn_data_set_cut_c, wn_data_extrema, wn_data_recall,
	wn_data_query, wn_data_polyfit_c, wn_data_fft_c, intro_graphics_windows

	C/C++ usage:

	int	status;
	float	x_mean;
	float	y_mean;

	status = wn_data_mean(&x_mean,&y_mean);