He bought 3 small notebooks (3*7=21) and 3 large notebooks (3*10=30)
21+30=51
Answer: C. 
Step-by-step explanation:
The confidence interval for difference of two population mean is given by :-
Given : Level of significance : 
Then , significance level : 
Critical value : 
Hence, a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides
So the first thing you would have to is to find a common denominator so a common denominator between 11 and 15 is 165. 3/11 * 15 =45/165 next you would do 7/15 * 11=77/165 no that both denominators are the same we add the numerator but the denominator stays the same so 45/165 + 77/165 = 122/165
and since it can't be reduced any more 122/165 is your answer.
hope this helps :)
Answer:
B.
Step-by-step explanation:
Have a good day i hope this helps :)
Answer:
about 50
Step-by-step explanation:
that's all I can think of
