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A box contains 10,000 marbles: 6,000 are red and 4,000 are blue. 500 marbles are drawn...

A box contains 10,000 marbles: 6,000 are red and 4,000 are blue. 500 marbles are drawn at random without replacement. Suppose there are 218 blue marbles in the sample.   
A) Find the expected value for number of blues in the sample, the observed value, the chance error, and the standard error.  

B) Find a 68% Confidence interval.  

C) Find a 99.7% Confidence Interval

math   Statistics-And-Probability   
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Answer #1

The standard Error is also approximately 3.6

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