Answer:
The test statistic is -1.00
Step-by-step explanation:
Test statistic (Z) = (sample mean - population mean) ÷ sd/√n
sample mean = 38.8miles/gallon, population mean = 39miles/gallon, sd = 2.2miles/gallon, n = 120vans
Z = (38.8 - 39) ÷ 2.2/√120 = -0.2 ÷ 2.2/10.95 = -0.2 ÷ 0.20 = -1.00 (to 2 decimal places)
Well, for this question we can start off by making an equation
(6.4)2
This problem is quite simple actually so we will just multiply 6.4*2
6.4*2=12.8 miles
The answers are (2 1/2, 10) and (3, 12)
//I just took the test and these were the answers
Answer:
The value of n = 4 and
The value of x = 
Step-by-step explanation:
Method I:
As given, 12x -20=n (3x-5) .........(1)
Firstly , take 12x - 20
As 12x - 20 can be written as 4(3x - 5)
∴ equation (1) becomes
4(3x - 5) = n (3x-5)
Divide the equation by (3x-5) , we get
4 = n
Method II:
As given, 12x -20=n (3x-5)
⇒12x - 20 = 3nx - 5n
⇒12x - 3nx = 20 - 5n
⇒3x(4 - n) = 5( 4 - n)
Divide the equation by (4-n) , we get
3x = 5
⇒ x = 
∴ we get
n = 4 and x = 
Now, check that value of n and x satisfies the equation or not
12(
) - 20 = 4( 3(
) - 5)
⇒4(5) - 20 = 4(5 - 5)
⇒20 - 20 = 4(0)
⇒ 0 = 0
Hence , we get
The values of x and n satisfies the equation
so, we get
n = 4 and x = 
Answer: C. 1,485 cubic feet
Step-by-step explanation:
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