Victoria spins the spinner 18 times, and it stops at the letter 'B' 10 times. If she spins the spinner a 20th time, what is the theoretical probability that this time it will stop at the letter 'B'?
 1 over 20
 1 over 18
 1 over 14
 1 over 10
                                             
                                          
                                          
                                        
											