It Is Known That the Population Mean for the Verbal

Multiple Choice

It is known that the population mean for the verbal section of the SAT is 500 with a standard deviation of 100.In 2006, a sample of 400 students whose family income was between $70,000 and $80,000 had an average verbal SAT score of 511.The point estimate of the mean for this group is _____ and the 95 percent confidence interval for this group is _____.

A) 500; [501.2, 520.8]
B) 500; [490.2, 509.8]
C) 511; [501.2, 520.8]
D) 511; [490.2, 509.8]