Probability(error in one block)= 1/5
<span>Probability(error in 3 blocks)= 3*(1/5)= 0.6</span>
Let,
0 = No error
<span> 1 = error
</span>Hence.
E(x) = 0.4 x 0 x+0.6 + 1
= 1.6
<h2>
Answer: 2.8 miles</h2>
Step-by-step:
We can write it in the proportion 
where x is our number of miles trying to find
We now cross multiply or use the butterfly method which I will demonstrate both
<h3>Cross Multiply</h3>
We multiply the numerator with the dominator
so 
and 



or 
Now for the
<h3>Butterfly Method </h3>
You would do 7 times 24 divided by 60 or 
Then
simplify
so 2.8 miles in either method
Answer:
6 ways.
Step-by-step explanation:
a, b, c
a, c, b
b, a, c
b, c, a
c, a, b
c, b, a