The Tread Life of a Particular Brand of Tire Is

question 131

Multiple Choice

The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2300 miles. What is the probability a particular tire of this brand will last longer than 57,700 miles?

• A) .8413
• B) .1587
• C) .2266
• D) .7266

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Definitions:

Zygote

The initial cell formed when a new organism is conceived, created by the merging of female and male reproductive cells.

Cytosine

One of the four main nucleobases found in DNA and RNA, which pairs with guanine.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of DNA, carrying genetic information.

Genes

Segments of DNA that code for specific traits in an organism.