In a certain population, body weights are normally distributed ...

[biggirl4568]

In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds.
 
  How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96 confidence that the error is no more than 2.5 percentage points.
  A) 591 B) 811 C) 1281 D) 1682

Question 2

A newspaper article about the results of a poll states: In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 2 percentage points in either direction from what would have been obtained by interviewing all voters
 
  in the United States. Find the sample size suggested by this statement.
  A) 165 B) 2402 C) 3394 D) 4145

[cici]

Answer to Question 1

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Answer to Question 2

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[biggirl4568]

Gracias!

[cam1229]

Excellent