Concept explainers
To calculate standard deviation.
Answer to Problem 9PPS
Standard deviation is 4.34.
Explanation of Solution
Given information: Data of Samantha and her friend’s charge per hour,
$8.00, $8.50, $9.00, $7.50, $15.00, $8.25, $8.75
Formula used: Mean is,
Standard deviation is,
Where, SD= standard deviation,
x = value
Calculation:
Re-arranging the values in an ascending order,
$7.50, $8.00, $8.50, $8.25, $8.75, $9.00, $15.00
For Mean,
Substituting the values in mean formula,
So,
On solving,
Hence, Mean is 9.28
For standard deviation,
Substituting the values in standard deviation formula,
So,
On solving,
So,
On removing the under-root,
Hence, the standard deviation is 4.34.
The standard deviation of the given data setis low,that means, the points are closer to mean.
Chapter 10 Solutions
Algebra 1, Homework Practice Workbook (MERRILL ALGEBRA 1)
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