I got 9.75 hope it's right
etc.
Hard to select the correct answers without seeing the choices. Let's check a couple,
Answer:
5.60
Step-by-step explanation:
3.50 + 60 % (2.10)= 5.60
Answer:
The median is 20.5
the average is 21
Step-by-step explanation:
Answer:
a.1.90 years
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
In this question:
So
So the correct answer is:
a.1.90 years