Compact Fluorescent Bulbs Are More Energy-Efficient Than Incandescent Bulbs, but They

question 33

Multiple Choice

Compact fluorescent bulbs are more energy-efficient than incandescent bulbs, but they take longer to reach full brightness. The time it takes for a compact fluorescent bulb to reach full brightness is normally distributed with mean 29.9 seconds and standard deviation 4.9 seconds. Find and interpret the z-score for x=26.1.

• A) z=0.71: the time to reach full brightness is 0.71 standard deviations above the mean.
• B) z=0.71: the time to reach full brightness is 0.71 standard deviations below the mean.
• C) z=-0.78 : the time to reach full brightness is 0.78 standard deviations below the mean.
• D) z=-0.78: the time to reach full brightness is 0.78 standard deviations above the mean.

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Definitions:

Lien

With respect to goods, it is the right to retain the goods until payment is made.

Mortgagee

The lender or financial institution in a mortgage agreement, who holds the mortgage as a security for the loan provided to the borrower.

Construction Lien

A legal claim against a property by a contractor or subcontractor for unpaid work or materials.

Building Contract

A legal agreement detailing the terms under which construction work is to be carried out, including obligations, timelines, and payment details.