Answer:
A sample of 18 is required.
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 Z-table as such z has a p-value of
.
That is z with a pvalue of
, so Z = 1.88.
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.
A previous study indicated that the standard deviation was 2.2 days.
This means that 
How large a sample must be selected if the company wants to be 92% confident that the true mean differs from the sample mean by no more than 1 day?
This is n for which M = 1. So



Rounding up:
A sample of 18 is required.
Answer:
$3.50
Step-by-step explanation:
the apples cost $1.40 per pound, so if we have 2.5 pounds, we would need to do this:
1.40 × 2.5
3.5
I hope this helps!
A fraction that is equivalent to 1/4 is 25/100
Answer: 180
Step-by-step explanation:
i got you!!!!!!! Hope u pass