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Probability - Confidence Interval for population proportion

Question :
From a population of 1600 documents a random sample of 100 documents is drawn and found 10 defects in the sample. Find the representative number of defects in the total population of 1600 documents at 80% confidence level, at 90% confidence level and at 95% confidence level.
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Therefore, we can be 95% confident that the number of defects in the total population of 1600 documents would be between 69 ...

Solution Summary

S.E of p = 0.029056
95% confidence limits of defects .....

Representative number of defects in the total population = (68.8 , 251 )

90% confidence limits ............
80% confidence limits .............
95% confident that the number of defects ..........

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