10000 Obs Sample from a Normal Distribution
with Mean=50 and Standard Deviation=10

              Frequency                                         
                                                                
                  |              *                              
              800 +              ***                            
                  |              ****                           
                  |             ******                          
                  |            *******                          
              600 +            *******                          
                  |           **********                        
                  |          ***********                        
                  |          ***********                        
              400 +          ************                       
                  |         *************                       
                  |        ***************                      
                  |       *****************                     
              200 +       ******************                    
                  |      *******************                    
                  |    **********************                   
                  |  ***************************                
                  --------------------------------              
                   2    3    4    5    6    7    8              
                   0    0    0    0    0    0    0              
                                                                
                   3    2    1    M    1    2    3              
                   *    *    *    e    *    *    *              
                   S    S    S    a    S    S    S              
                   t    t    t    n    t    t    t              
                   d    d    d         d    d    d              
                                                                
                             X Midpoint