Question

The registrar of a large university knows that 30% of the students come to college with credit for an advance placement (AP) course. The registrar is going to conduct interviews with students regarding their experiences at the university. Depending on which students are chosen, the proportion of students in the sample that have AP credit may vary.
In a sample of 200 students, what is the probability that over 32% of the sample has AP credit?

Answer 1

can you help explain this one?

Answer 2

what is the question?

Answer 3

sorry i posted the wrong thing

Answer 4

so we need to find the sample proportion

Answer 5

yes

Answer 6

first i would have to find the standard deviation though right?

Answer 7

I believe so.

Answer 8

so that would .00105

Answer 9

The standard deviation is given by
\[\large \sqrt{\frac {p(1-p)}{n}}\]
Can you see what step you missed in your calcuolation?

Answer 10

i forgot to take the square root

Answer 11

so it would be .0324

Answer 12

Correct!

Answer 13

what would my next step be?

Answer 14

@kropot72

Answer 15

Now you need to find the z-score for 0.32.