Answer:
The value is
Step-by-step explanation:
From the question we are told that
The population mean is 
The proportion is 
The value considered is 
Generally given that the speed measurement is normally distributed we have that

Generally


Hence

Answer:
-5/6
Step-by-step explanation:
3(1/6+2/9)+(-2)
3(7/18)+(-2) working what is in parenthesis.
7/6-2 reduced the numbers ( 3 and 18) with greatest common divisor . which is 3
-5/6 calculate the difference
In total, they would need 4 pumps. If we divide 55 by 17, we get just more than 3. This little more would need an entire pump. So the answer 4 total, 3 added