R=21. 21/3=7. To check your answer, you can do 7x3 and it'll equal 21.
Answer:
B
Step-by-step explanation:
you are comparing percent to percent and total boys to total class.
Answer:
the answer is A! goodluck with hw thk
Answer:
You will pay $42.50
Step-by-step explanation:
You will pay 50-7.5 which gives you 42.50
Answer:
Sample size minimum is 60
Step-by-step explanation:
given that you want to create a 99% confidence interval with a margin of error of .5.
The population standard deviation is equal to 1.5
i.e. 
Confidence level = 99%
Since population std deviation is known, we can use Z critical value for finding margin of error
Z critical value for 99% = 2.58
Margin of error = 
Equate this to 0.5 and solve for n
