A Report Noted That for the Population of 9th Graders

Multiple Choice

A report noted that for the population of 9th graders, one?third of the students are unable to pass a quiz in basic geography.One teacher, having spent a great deal of time on geography instruction, gave the same quiz to a group of n = 72.Only X = 18 students in the group did not pass the test.The teacher would like to know if the number of students in this class who failed the quiz is significantly different from the general population.For this test, what is the z-score corresponding to X = 18?

A) z = -0.375
B) z = -1.00
C) z = -1.50
D) z = -2.00