21.
4 gallons of gasExplanation:Since y = 86. y+6 = 23x. Then the equation becomes 86+6 = 23 x. When you solve this you will get x = 4. In other words, this car consumes 4 gallons of gas to 86 miles away. In other words, this car's gas (fuel) efficiency is 4.65 gallons of gas per one hundred mile.
Answer:
And using the normal standard table or excel we find the probability:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the avergae number of weeks an individual is unemployed of a population, and for this case we know the distribution for X is given by:
Where and
Since the distribution for X is normal then, the distribution for the sample mean is given by:
We select a sample of n =50 people. And we want to find the following probability
And using the normal standard table or excel we find the probability:
7-3x=4(2+x)<--Distribute
7-3x=8+4x
-7...... -7
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-3x=1+4x
-4x ....-4x
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-7x=1
/-7 /7
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x=-1/7
Y is 126° and x is 234°. hope this could help!