NEED ASAP

1.) The president of a university would like to estimate the proportion of the student population that owns a personal computer. In a sample of 500 students, 417 own a personal computer. Find the margin of error for a 95% confidence interval for the proportion of the student population who own a personal computer.

2.)The actual voltages of power packs labeled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. a confidence interval for this sample would be based on thetdistribution with ________ degrees of freedom.

3.)A study at a college in the west coast reveals that, historically, 64% of the students are minority students. If a random sample of size 64 is selected, the probability is ________ that between 50% and 70% of the students in the sample will be minority students.