Mean is 
and a standard deviation is 
, then the variable 
.
Use substitution
.
This substitution gives you that 
.
a. For X=130, 
and 
(the decimal value is taken from the Standard Normal Distribution Table).
b. For X=90, 
and for X=110, 
. Then 
(the decimal value is taken from the Standard Normal Distribution Table).
Divide the k own number by the percentage:
66 / 0.75 = 88
66 is 75% of 88
Answer:
2 miles = 126720 (looked it up)
Step-by-step explanation:
