Answer:
A.

Step-by-step explanation:
Since the denominators are the same we just have to combine the top.

Combine alike terms.

put that over our denominator.

The answer would be B. 2 times the X number minus 2 would be the Y for each.
Answer:
the answer is 29
Step-by-step explanation:
Answer:
-0.461
Step-by-step explanation:
By formula we know that z is equal to:
z = (x - m) / sd
of the statement we have the following information:
x is the reference value which is 40 mg
m = the sample mean is 42.4 mg,
sd = the standard deviation in all cans is 5.2 mg.
Replacing we have:
z = (40 - 42.4) /5.2
z = -0.461
Therefore the value of z is -0.461