Answer: 0.00067 minutes 
Step-by-step explanation: if the proportion of customers who wait more than 15 minutes is 0.01, then the time interval between each waiting customer 15/0.01 = 1500 minutes. 
The distribution that defines this question is that of an exponential. 
An exponential distribution is dependent on the fixed time rate at which the event is occurring (λ)
For this question of ours, λ = 1500 minutes.
The mean of an exponential distribution is given as 
 u = 1/ λ = 1/1500 = 0.00067 minutes. 
 
        
             
        
        
        
Step-by-step explanation:
wait a person was about to report it sorry ;/
had to take it off
 
        
             
        
        
        
Answer:
1. Not accounting for the difference in the base of the exponent when applying the quotient rule. 
2. Not subtracting the exponents of the denominator from the exponent of the numerator when applying the quotient rule.
 
        
             
        
        
        
3w-7w-12=2w-6
-4w-12=2w-6
-12=6w-6
-6=6w
w=-1