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29.10.2020 •
Mathematics
A frequency distribution for the response time for EMTs after a 911 call is shown below.
Response Time for EMTS
Frequency
Response Time
(in minutes)
7-7.9
19
8-8.9
23
9-9.9
38
47
10 - 10.9
11 - 11.9
12 - 12.9
43
29
13-13.9
21
Step 2 of 2: Calculate the population variance for the response time. Round any intermediate calculations, if needed, to no less than four decimal places, and round
your final answer to two decimal places.
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Ответ:
σ² = 2.90
Step-by-step explanation: For a frequency table, population variance is calculated by:
where
f is frequency
μ is expected value or mean of the distribution
In this case, mean of the distribution for a grouped frequency table is calculated by:
where
x is (as the data is grouped) the mid value of the response time
So, the table is
x | f
6.45 | 18
7.45 | 21
8.45 | 34
9.45 | 46
10.45 | 46
11.45 | 25
12.45 | 21
And mean will be:
μ = 9.5874
To calculate the variance, the formula above is transformed into
So, to facilitate the calculations, divide each term in a table:
f | x | f.x | f.x²
18 | 6.45 | 116.1 | 748.845
21 | 7.45 | 156.45 | 1165.5525
34 | 8.45 | 287.3 | 2427.685
46 | 9.45 | 434.7 | 4107.915
46 | 10.45 | 480.7 | 5023.315
25 | 11.45 | 286.25 | 3277.5625
21 | 12.45 | 261.45 | 3255.0525
∑ 211 | | 2022.95 | 20005.9275
Population variance will be:
σ² = 2.90
The population variance for the response time for EMTs is 2.90.
Ответ:
14m^2 +35
Step-by-step explanation: