Ch. 6.1 #7-49 odd
Ch. 6.1 #7-49 odd
Ch. 6.1 #7-49 odd
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. More than $40,000 a year<br />
X <br />
40,000 47,750<br />
z 1.36<br />
5680<br />
Pz ( 1.36) 1 0.0869 0.9131 or 91.31%<br />
c. If you were applying for a teaching position and were offered $31,000 a year, how would you feel<br />
(based on this information)?<br />
Not too happy! It's really at the bottom of the heap!<br />
X <br />
31,000 47,750<br />
z 2.95<br />
5680<br />
Pz ( 2.95) 0.0016<br />
Only 0.16% of salaries are below $31,000.<br />
9. Miles Driven Annually The mean number of miles driven per vehicle annually in the United States is<br />
12,<strong>49</strong>4 miles. <strong>Ch</strong>oose a randomly selected vehicle, and assume the annual mileage is normally distributed<br />
with a standard deviation of 1290 miles. What is the probability that the vehicle was driven more than<br />
15,000 miles? Less than 8000 miles? Would you buy a vehicle if you had been told that it had been driven<br />
less than 6000 miles in the past year?<br />
X <br />
15,000 12,<strong>49</strong>4<br />
For x15,000 miles : z 1.94<br />
1290<br />
Pz ( 1.94) 1 0.9738 0.0262<br />
X <br />
8,000 12,<strong>49</strong>4<br />
For x 8,000 miles : z 3.48<br />
1290<br />
Pz ( 3.48) 0.0003<br />
X <br />
6,000 12,<strong>49</strong>4<br />
For x 6,000 miles : z 5.03<br />
1290<br />
Pz ( 5.03) 0.0001<br />
Maybe it would be good to know why it had only been driven less than 6000<br />
miles.<br />
11. Credit Card Debt The average credit card debt for college seniors is $3262. If the debt is normally<br />
distributed with a standard deviation of $1100, find these probabilities.
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