I think it’s a I’m not really sure but I think
        
             
        
        
        
Answer:  The probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .
Step-by-step explanation:
The cumulative distribution function for exponential distribution is :-
 , where
, where  is the mean of the distribution.
 is the mean of the distribution.
As per given , we have
Average tread-life of a certain brand of tire :  
Now , the probability that a randomly selected tire will have a tread-life of less than 65,000 miles will be :

Hence ,  the probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .
 
        
             
        
        
        
Answer:
<em>Alex sold 330 white chocolate bars</em>
Step-by-step explanation:
let the milk chocolate candy be x and the white chocolate candy be y. then
then 2x+3y=990----1)
x+y=330-----2)
from eq 2) ⇒ x=330-y---------3)
Putting eq 3 in eq 1
2(330-y) +3y=990
660-2y+3y=990
y=990-660=330-----------4)
Putting eq4 in eq1 
2x+3(330)=990
2x+990=990
2x=990-990
2x=0
x=0---------------------------5)
 
        
             
        
        
        
Answer:
11
Step-by-step explanation:
1.80m + 0.6s = 12.00
[substitute the value of m into the equation]
1.80×(3) + 0.6s = 12
5.4 + 0.6s = 12
[make s the subject of the formula]
0.6s = 12 - 5.4
0.6s = 6.6
[divide both sides of the equation by 0.6]
0.6s / 0.6 = 6.6 / 0.6
s = 11
To prove that 11 is correct
[substitute the value of m and s into the equation]
1.80m + 0.6m = 12.00
1.80×(3) + 0.6×(11) = 12.00
5.4 + 6.6 = 12.00
12.00 = 12.00