THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Let the random variable X follow a normal distribution with a mean of μ and a standard deviation of σ.Let 
1 be the mean of a sample of 16 observations randomly chosen from this population,and 
2 be the mean of a sample of 25 observations randomly chosen from the same population.
-Suppose that 15% of all invoices are for amounts greater than $1,000.A random sample of 60 invoices is taken.What is the mean and standard error of the sample proportion of invoices with amounts in excess of $1,000? What is the probability that the proportion of invoices in the sample is greater than 18%?
Definitions:
Lead Singer
The primary vocal artist in a band or musical group, often the focal point during performances.
Microphone
A device that converts sound waves into electrical signals for amplification, recording, or transmission.
Topic Sentence
A sentence that expresses the main idea of the paragraph in which it occurs, serving as a summary or introduction to the content that follows.
Walt Disney
An American film producer, director, screenwriter, voice actor, and animator, founder of The Walt Disney Company.
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