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1. A business wants to estimate true mean annual income of its customers. The business needs to be in $500 of true mean. The business estimates true population standard deviation is around $2,300. If the confidence level is 95%, find out the required sample size in order to meet wanted accuracy.

2. The area under the normal curve with mu = 15 and sigma = 2 is

A) none of these

B) 0

C) 2

D) 1

Statistics and Probability, Statistics

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