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find the z and p value

In 1995 a national vital statistics report indicated that about 2% of all births produced twins. In the rate of twin births the same among very young mothers? Data from a large hospital found only 9 sets of twins were born to 527 teenage girls. 

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Andre W. | Friendly tutor for ALL math and physics coursesFriendly tutor for ALL math and physics ...
5.0 5.0 (3 lesson ratings) (3)
two-sided 1-proportion-z-test:
H0: p0=0.02
Ha: p0≠0.02
X=9, n=527
Use TI-84 to find
z=-.479, P=0.632
Not significant at 10% level, don't reject H0.