Textbook ExpertVerified Tutor
18 Nov 2021
Given information
| Instrument | Cost | Average cost | Standard deviation |
| Piano | 3000 | 4000 | 2500 |
| Guitar | 550 | 500 | 200 |
| Drum | 600 | 700 | 100 |
Step-by-step explanation
Step 1.
In order to compare the student’s performance when we have different types of scores under consideration the z-score can be used.
Z-score tells how many standard deviation a particular value is above or below the mean.
Formula used:
Where, 
is any data value
is the population mean
is the population standard deviation
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
Solutions
Chapter
Section
- Problem 74a
- Problem 74b
- Problem 75a
- Problem 75b
- Problem 75c
- Problem 76a
- Problem 76b
- Problem 76c
- Problem 76d
- Problem 76e
- Problem 76f
- Problem 77a
- Problem 77b
- Problem 77c
- Problem 77d
- Problem 77e
- Problem 77f
- Problem 77g
- Problem 77h
- Problem 78a
- Problem 78b
- Problem 79
- Problem 80
- Problem 81
- Problem 82a
- Problem 82b
- Problem 82c
- Problem 83a
- Problem 83b
- Problem 83c
- Problem 83d
- Problem 83e
- Problem 84a
- Problem 84b
- Problem 84c
- Problem 84d
- Problem 84e
- Problem 85a
- Problem 85b
- Problem 86a
- Problem 86b
- Problem 86c
- Problem 87a
- Problem 87b
- Problem 88a
- Problem 88b
- Problem 89a
- Problem 89b
- Problem 89c
- Problem 89d
- Problem 89e
- Problem 89f
- Problem 89g
- Problem 89h
- Problem 90
- Problem 91a
- Problem 91b
- Problem 91c
- Problem 92
- Problem 93a
- Problem 93b
- Problem 93c
- Problem 94
- Problem 95a
- Problem 95b
- Problem 96
- Problem 97
- Problem 98
- Problem 99
- Problem 100
- Problem 101
- Problem 102
- Problem 103
- Problem 104
- Problem 105a
- Problem 105b
- Problem 106
- Problem 107