Mean Std. dev. Result reater/Less/Betwee Answer Q 11 50 4 44 50 4 55 Between 44-55 Q12 50 4 55 Greater than 55 Q13 50 4 52 50 4 55 Between 52-55 Q14 3401 82.5 3500 11.51% More than 3500 0.1151 Q15 3401 82.5 3500 98.45% 3401 82.5 3579 88.49% Between 3500-3579 9.96% Q16 3401 82.5 3325 98.45% 3401 82.5 3579 17.85% Between 3325-3579 80.60% Q17 15 3.5 20 92.34% More than 20 7.66% Q18 15 3.5 20 92.34% Less than 20 92.34% Q19 15 3.5 10 19.57% 15 3.5 12 7.66% Between 10-12 11.91%

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter4: Polynomial And Rational Functions
Section4.6: Rational Functions
Problem 11SC: Find the mean hourly cost when the cell phone described above is used for 240 minutes.
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In order to find probability, you can use this formula in Microsoft Excel: 
 The best way to understand and solve these problems is by first drawing a bell curve and 
marking key points such as x, the mean, and the areas of interest. Once marked on the bell 
curve, figure out what calculations are needed to find the area of interest. 
 =NORM.DIST(x, Mean, Standard Dev., TRUE). 
 When the question mentions “greater than” you may have to subtract your answer from 1.
  When the question mentions “between (two values)”, you need to do separate calculation for 
both values and then subtract their results to get the answer.

Mean
Std. dev.
Result reater/Less/Betwee Answer
Q 11
50
4
44
50
4
55
Between 44-55
Q12
50
4
55
Greater than 55
Q13
50
4
52
50
4
55
Between 52-55
Q14
3401
82.5 3500 11.51%
More than 3500 0.1151
Q15
3401
82.5
3500 98.45%
3401
82.5
3579
88.49% Between 3500-3579 9.96%
Q16
3401
82.5
3325 98.45%
3401
82.5
3579
17.85% Between 3325-3579 80.60%
Q17
15
3.5
20
92.34%
More than 20
7.66%
Q18
15
3.5
20
92.34%
Less than 20
92.34%
Q19
15
3.5
10
19.57%
15
3.5
12
7.66%
Between 10-12
11.91%
Transcribed Image Text:Mean Std. dev. Result reater/Less/Betwee Answer Q 11 50 4 44 50 4 55 Between 44-55 Q12 50 4 55 Greater than 55 Q13 50 4 52 50 4 55 Between 52-55 Q14 3401 82.5 3500 11.51% More than 3500 0.1151 Q15 3401 82.5 3500 98.45% 3401 82.5 3579 88.49% Between 3500-3579 9.96% Q16 3401 82.5 3325 98.45% 3401 82.5 3579 17.85% Between 3325-3579 80.60% Q17 15 3.5 20 92.34% More than 20 7.66% Q18 15 3.5 20 92.34% Less than 20 92.34% Q19 15 3.5 10 19.57% 15 3.5 12 7.66% Between 10-12 11.91%
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