The following frequency distribution shows the number of crimes committed in a sample of 100 urban neighborhoods.   Number of crimes                                    Frequency of Neighborhoods                0-9                                                   10            10-19                                                   20            20-29                                                   30            30-39                                                   30            40-49                                                   10           N                                                            100   What is the (approximate) standard deviation of this distribution?

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