The Manager of a Grocery Store Has Taken a Random

question 9

Multiple Choice

The manager of a grocery store has taken a random sample of 100 customers.The average length of time it took these 100 customers to check out was 3 minutes.It is known that the standard deviation of the population of checkout times is 1 minute.The standard error of the mean equals

• A) .001.
• B) .010.
• C) .100.
• D) 1.000.

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Definitions:

Isotopic Ages

Measures the time elapsed since a particular mineral or rock formed, based on the decay rates of radioactive isotopes.

Billion Years

A period of time equal to 1,000 million years, often used in geological and astronomical contexts to describe the age of Earth or the universe.

Mineral Grains

individual particles or crystals within a rock, defining its texture and often determining its properties and classification.

Cenozoic

The current geological era, beginning 66 million years ago, marked by significant development of mammals.