At basketball practice you made 21
2 answers:
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Answer:
The standard deviation of the sample is 2.55 gigabytes
Step-by-step explanation:
Here we have the responses as follows;
Storage space usage on their computer
The number of respondents or sample size, n = 5
4 -4 16
8 0 0
8 0 0
9 1 1
11 3 9
∑ 40 26
The sum = ∑X = 4 + 8 + 8 + 9 + 11 = 40
The mean = (The sum)/(The count) = 40/5 = 8
Formula for population standard deviation is;
Where:
σ = Population standard deviation
μ = Population mean
Since we are dealing with only 5 out of her hundreds of coworkers we are dealing with a sample therefore;
The formula for sample standard deviation is;
Where:
s = Sample standard deviation
n = Sample size
= Each value of the sample
= Sample mean
We find each value of by subtracting the x values from the mean, 8, as in the table above, next we find
by squaring the
.
Next, we find the sum of the differences from the mean square values from the table after which we divide by n - 1, to get
We find the root of the result which gives us the standard deviation hence
√6.5 = 2.5495.
Standard deviation, s = 2.5495 ≈ 2.55 to two significant places of decimal.