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According to a recent poll, 65% of adults who use the Internet have paid to download...

According to a recent poll, 65% of adults who use the Internet have paid to download music. In a random sample of size 675, adults who use the Internet, let [^(p)] represent the sample proportion who have paid to download music.

1. Find the mean of the sampling distribution of [^(p)]. Answer to 2 decimal places.


2. Find the standard deviation of the sampling distribution of [^(p)]. Answer to 4 decimal places

3. Compute the probability that [^(p)] is less than 0.631. Answer to 4 decimal places.


4. Find a such that P(0.65 − a < [^(p)] < 0.65 +a ) = 0.88. Answer to 3 decimal places.

Math   Statistics-And-Probability   
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