Question 899883
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Hi
Ho: p >= 12.500 (claim)
Ha: p <12,500 
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Sample:
mean = 12031
s = 1606.595
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test stat:: z(12031) = (12031-12500)/[1606.6/sqrt(10)] =  - 499/508.1 = -.9821
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p-value = P(z < -.9821) = .1630
Conclusiion: 
Since the p-value is greater than .01, accept claim.
The test results support the claim.