The data show the number of murders in 25 selected cities. Class limits Frequency 3496 .........13 97159
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Class limits Frequency
34–96 .........13
97–159 .........2
160–222 .......0
223–285 .......5
286–348 .......1
349–411 .......1
412–474 .......0
475–537 .......1
538–600 .......2
Find the variance and standard deviation.
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