(a) What is the probability that more than  30 drivers will fail to activate their turn signal before changing lanes                                                                                                                                                                                                                                                       (b) What is the standard deviation of the number drivers who do not activate their turn signals before changing lanes?                                                                                                                                                                                                                                                        (c) What is the probability  that between  18 and 26 drivers (both numbers included in the interval) will fail to use their turn signals   before changing lanes?

 

  Despite all the safety instructions they have received, many drivers do not activate their turn signals before changing lanes on the highway  
leading to accidents and even fatalities.  Historical data shows that about 30% of drivers fail to signal before changing lanes      
A traffic safety officer observed  110 cars changing lanes on I-66 over the course of his shift.              
                                 
                                 
(a) What is the probability that more than  30 drivers will fail to activate their turn signal before changing lanes        
                                 
                                 
                                 
                                 
                                 
                                 
                                 
(b) What is the standard deviation of the number drivers who do not activate their turn signals before changing lanes?         
                                 
                                 
                                 
                                 
                                 
                                 
                                 
(c) What is the probability  that between  18 and 26 drivers (both numbers included in the interval) will fail to use their turn signals
  before changing lanes?                            

 

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