THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Suppose that 20% of all invoices are for amounts greater than $800.A random sample of 50 invoices is taken.
-What is the mean and standard error of the sample proportion of invoices with amounts in excess of $800?

A) mean = 10,standard error = 0.4472
B) mean = 0.20,standard error = 0.0566
C) mean = 0.20,standard error = 0.0032
D) mean = 10,standard error = 0.0598