Answer: -1.5
Step-by-step explanation:
When population standard deviation is known, then the formula to find the z-test statistic for population mean is given by :-
, where n= Sample size.
= Population mean
= Sample mean
= Population standard deviation.
As per given , we have (average infants contracted typhoid each month)
n= 4 (No. of months)
Then , the value of the appropriate test statistic will be :
Hence, the value of the test statistic = -1.5
Answer:
A
Step-by-step explanation:
112/0.8 = 140
Answer:
Step-by-step explanation:
Given function is,
f(x) =
Equation form of the function will be,
y =
Interchange x and y,
Solve for y,
y = 2x + 1
Therefore, inverse of the function 'f' will be,
Now = 2 - [2x + 1]
= -2x + 1
Value of = f(2x + 1)
From the given function,
f(2x + 1) =
= x
Therefore, value of
A (x,-y). When you reflect over the x-axis, the y becomes negative