Answer:
93
Step-by-step explanation:
If she halves it she divided it by 2. So, all you have to do is reverse that procss by multiplying by 2. I hope this helps :)
 
        
                    
             
        
        
        
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X - (-20) = 5
When you subtract a negative, change it to addition:
X + 20 = 5
Subtract 20 from both sides:
X = -15
 
        
                    
             
        
        
        
Answer:
0.0821
Step-by-step explanation:
If the arrival rate is 50 customers per hour (60 minutes), then the expected number of customers in 3 minutes is:

Assuming a Poisson distribution with 2.5 customers per 3 minutes, the probability that zero customers arrive for 3 minutes is:

The probability that the bank stays empty for three minutes is 0.0821.