An Accounting Firm Is Planning for the Next Tax Preparation

question 13

Multiple Choice

An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the probability that average preparation time is between 80 and 90 minutes?

• A) 0.7143
• B) 0.7625
• C) 0.2375
• D) 0.2625

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Definitions:

Arsenic Minerals

Natural crystalline materials containing the element arsenic as a principal component.

Arsenic Ions

Ions that contain arsenic in different oxidation states, often toxic and present in various environmental and industrial contexts.

Orpiment

A natural mineral composed of arsenic sulfide (As2S3), historically used as a pigment and with various industrial and medicinal applications.

Soluble Sulfide

A compound containing the sulfide ion that is soluble in water, often producing hydrogen sulfide gas upon contact with acid.