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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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1 Answer

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.