Administrative Assistants in a Local University Have Been Asked to Prove

question 45

Short Answer

Administrative assistants in a local university have been asked to prove their proficiency in the use of spreadsheet software by taking a proficiency test.Historically,the mean test score has been 74 with a standard deviation of 4.A random sample of size 40 is taken from the 100 administrative assistants and asked to complete the proficiency test.
A)Calculate the expected value and the standard deviation of the sample mean.
B)What is the probability that the sample mean score is more than 75,the predetermined passing score?

• A)Calculate the expected value and the standard deviation of the sample mean.
• B)What is the probability that the sample mean score is more than 75,the predetermined passing score?

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Definitions:

Invest

The action of allocating resources, usually financial, into something with the expectation of generating income or profit.

Money Supply

The total amount of money available in an economy at a particular time, including cash and bank deposits.

Well-reasoned Decisions

Choices or conclusions derived from careful thought, analysis, and evaluation of relevant information.

Rational Expectations

The hypothesis that people form forecasts about the future based on all available information in an unbiased manner and learn from past mistakes.