Answer:
The right solution is "0.196".
Step-by-step explanation:
The given values are:
Standard deviation,

Sample size,

Confidence level,
%

Now,
For 


then,



The margin or error will be:
⇒ 
On substituting the values, we get
= 
= 
= 
The correct answer : $8.50 / 1 hour
14, B. I hope that helps! :)
2. |x|=-7
-x=-7. x=-7
x=7. x=-7