help me pls (20 pts)
24 CALCULATING STANDARD DEVIATION
The standard deviation is used to tell how far on average any data pointis from the mean. The smaller the standard
deviation, the closer the scores are on average to the mean. When the standard deviation is large, the scores are more
widely spread out on average from the mean,
The standard deviation is calculated to find the average distance from the mean.
Practice Problem #1: Calculate the standard deviation of the following test data by hand. Use the chart below to
record the steps.
Mean:
Test Score
(x)
Test Scores: 22, 99, 102, 33, 57, 75, 100, 81, 62, 29
Difference from the mean
(x-x)
Sum of (Difference from the mean)
X(x-x)
i of Difference from the Mean) divided by degrees of freedom (n-1)
Σ(x-n)²
Date
Standard deviation fouere rent of w
(Difference from the mean)
(x-3)²
This is called varlance.
at you just calculated brarianco)