One sample has n = 10 scores and M = 30. A second sample has n = 20 scores and M = 40. If the two samples are combined, then the combined sample will have a mean _____.

	a.	half-way between 30 and 40.
	b.	closer to 30 than it is to 40.
	c.	closer to 40 than it is to 30.
	d.	none of the above.