Concept explainers
To find the range and standard deviation of each data set.
Answer to Problem 6CR
Standard deviation and mean for store A are $39.37 and $190 respectively.
Standard deviation and mean for store B is $48.08 and $232.5.
Explanation of Solution
Given information:
Two datasets of tablet price
Formula used:
Mean,
Standard deviation,
Calculation:
Store A,
N=8
Substituting values,
Solving,
Mean is $232.5
Standard deviation,
Items | ||
140 | -7.5 | 56.25, |
200 | 27.5 | 756.25 |
150 | -42.5 | 1806.25 |
250 | -72.5 | 5256.25 |
180 | 77.5 | 6006.25 |
250 | -42.5 | 1806.25 |
190 | 52.5 | 2756.25 |
160 | 7.5 | 56.25 |
Substituting values,
Hence, standard deviation for store A is $48.08.
Store B,
N=8
Substituting values,
Solving,
Mean is $190.
Standard deviation,
Items | ||
225 | -50 | 2500 |
260 | 10 | 100 |
190 | -40 | 1600 |
160 | 60 | 3600 |
310 | -10 | 100 |
190 | 60 | 3600 |
285 | 0 | 0 |
240 | -30 | 900 |
Substituting values,
Hence, standard deviation for store A is $39.37.
Chapter 11 Solutions
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