Answer:
Step-by-step explanation:
What is the margin of error if the sample size is 100, sample mean is 68.0, and standard deviation is 4.0
The Margin of error formula =
± z score × s/√n
Where s = standard deviation= 4
n= Number for samples = 100
z = z score of confidence interval
Margin of error = ± z × 4/√100
Margin of error = ±z × 4/10
=± z × 2/5
= ± z × 0.4
= ± 0.4z
Margin of error = ± 0.4z
10 and 15 dear^^ 5(15) + 3(15) =28
Answer:
z=6 and z=-6
Step-by-step explanation:

Divide both sides by 7

Find the square root
z=±√36
z=±6
Therefore, z=6 and z=-6.
I hope this helps!
Answer:
You would get 17
Step-by-step explanation:
7 - (-10) = 17
Hope this helps!
You should use 22/7 when you are dealing with other fractions.