Answer:
sorry i dont get it.
Step-by-step explanation:
When you go to select the 2 pair to take ...
-- The first one can be any one of the 7 you own. For each if these . . .
-- The second one can be any one of the remaining 6 you own.
-- So there are (7 x 6) = <em>42 ways</em> to choose 2 pairs of jeans.
<u>But</u> . . . . .
When you finish packing the 2 pairs of jeans you chose, it doesn't
matter which one was chosen first and which one was chosen last.
The same jeans could have been chosen for the trip in two
different ways.
Although there are 42 <u>ways</u> to choose two pair, the same two pair
can be chosen in 2 different ways. So there are only 42/2 = 21
different <u>sets</u> of jeans that can end up going on vacation.
Answer:
Kadeem will take 0.166 h more to complete the course.
Step-by-step explanation:
The speed is the rate at which the distance changes, when the speed goes up the distance changes more quickly, therefore if the distance is the same and the speed is higher the one who will take longer is the one that has less speed. In this case the one who will take longer to drive the 25 miles is Kadeem, since he's driving at 50 mph. In order to calculate how much longer we need to calculate the time at which each of them complete the course, this is shown below:
time = distance/speed
For Kadeem:
time = 25/50 = 0.5 h
For Quinn:
time = 25/75 = 0.334 h
The difference between the is 0.5 - 0.334 = 0.166 h.
Answer:
The 95% confidence interval for the population mean height of males of this country is between 67.136 inches and 74.864 inches.
Step-by-step explanation:
For the country, we only have the standard deviation of the sample, so we use the t distribution to build the confidence interval.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 45 - 1 = 44
Now, we have to find a value of T, which is found looking at the t table, with 44 degrees of freedom(y-axis) and a confidence level of 0.95(). So we have T = 1.68
The margin of error is:
M = T*s = 1.68*2.3 = 3.864
In which s is the standard deviation of the sample. So
The lower end of the interval is the sample mean subtracted by M. So it is 71 - 3.864 = 67.136 inches
The upper end of the interval is the sample mean added to M. So it is 71 + 3.864 = 74.864 inches
The 95% confidence interval for the population mean height of males of this country is between 67.136 inches and 74.864 inches.
Answer:
110
Step-by-step explanation:
Just break it into pieces and parts then add it together