Answer: -3.0593
Step-by-step explanation:
The test statistic for the difference between two population mean (when population standard deviations
are known ) is given by :-

where ,
= Sample sizes taken from two populations 1 and 2.
= Difference between two Sample mean.
= Standard deviations of populations 1 and 2.
As per given , we have
We assume that the data follows a normal distribution.
Then, the test statistic will be :-
Hence, the test statistic= -3.0593
Answer: X=12.7
Step-by-step explanation:
Sorry if its wrong I am pretty rusty with these kind of questions
Answer:
109
Step-by-step explanation:
99+10=109
.85x=10.2
your answer is x = 12