The average miles per gallon of a particular automobile model are approximately normally distributed with a given mean mc024-1.jpg = 43.8 miles per gallon and standard deviation mc024-2.jpg = 5.1 miles per gallon. what percentage of the automobiles have an average miles per gallon between 38.7 miles per gallon and 48.9 miles per gallon?
a.68%
b.75%
c.95%
d.100%

The correct answer is option(a).

Explanation:

= Standrad deviation

= Mean of the observations

Using standard Z-table: for and

For , the value from Z table = 0.1587

For , the value from Z table = 0.8413

Percentage of the automobiles have an average miles per gallon between 38.7 miles per gallon and 48.9 miles per gallon:

=0.8413 - 0.1587 = 0.6826 = 68.26 %

Hence, the correct answer option(a).

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.

trig 15.3 cos