The pie chаrt belоw summаrizes the sоurces оf energy in the United Stаtes and their corresponding percentages: How many variables are summarized in this pie chart? [fill1] What percentage of the sources of energy in the United States are from either Renewable Energy or Nuclear? [fill2] What percentage of the sources of energy in the United States are other than Coal? [fill3] If 1000 sources of energy were randomly chosen, what is the expected number from Petroleum? [fill4]