Does anybody know what variance and kurtosis tell about a probability distribution in statistics? I've tried the internet, but it still makes no sense to me.
This is the context:
QUALITY
Valid Cum
Value Label Value Frequency Percent Percent Percent
.00 3422 13.5 13.7 13.7
1.00 1187 4.7 4.8 18.5
2.00 1832 7.2 7.3 25.8
3.00 1746 6.9 7.0 32.8
4.00 1756 6.9 7.0 39.8
5.00 1736 6.8 6.9 46.8
6.00 1855 7.3 7.4 54.2
7.00 1594 6.3 6.4 60.6
8.00 1696 6.7 6.8 67.3
9.00 1556 6.1 6.2 73.6
10.00 1416 5.6 5.7 79.2
11.00 1146 4.5 4.6 83.8
12.00 1072 4.2 4.3 88.1
13.00 763 3.0 3.1 91.2
14.00 625 2.5 2.5 93.7
15.00 563 2.2 2.3 95.9
16.00 379 1.5 1.5 97.5
17.00 217 .9 .9 98.3
18.00 153 .6 .6 98.9
19.00 91 .4 .4 99.3
20.00 175 .7 .7 100.0
. 417 1.6 Missing
------- ------- -------
Total 25397 100.0 100.0
Mean 6.410 Std err .030 Median 6.000
Mode .000 Std dev 4.792 Variance 22.963
Kurtosis -.480 S E Kurt .031 Skewness .492
S E Skew .015 Range 20.000 Minimum .000
Maximum 20.000 Sum 160133.000
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