How many Native American tribes are recognized today by the federal government?

Although the revolution of 1848 resulted in the overthrow of many governments throughout Europe, it failed to obtain its objectives. It did, however, ___________

a. lead to the outlawing of unions in Europe, which would protect worker's rights b. define two sets of social movements: worker movements and national liberation movements c. stop the struggle in Europe to control colonial lands in Africa and Asia d. define two sets of grievances: laborers and practitioners

The statistical symbol for a sample mean is

a. ? b. ? c. X d. ?