B
BalooTheBear
I searched the old posts and couldn't find anything for a couple of questions I had. If any out there gets this stuff better than me, please help me out. Thank you so much...
QR125: The ratios are equal between men and woman. Then the number of men decreases by 20% and the number of woman increases by 20%. What is the current ratio of men to woman?
I got 2/3 for this but it says the correct answer is 3/2. Do I have the ratio concept backwards or is this an error?
QR140: What is the equation of the line of symmetry of the equation:
x^2 = 4(y+2) - 16
The correct answer is x=0
Do we need to know parabola stuff, because I don't really know it that well.
QR152: The temperature for the first week of the month of January were recorded as follows: 5, 10, 15, 8, 13, 17, 9. What is the mean and standard deviation of the set of data?
Correct answer is 11 and 3.9.
My question is how and I supposed to determine standard deviation? I understand how to get mean, but am so lost with standard deviation.
I also have another question from my Kaplan Blue Book CD-Rom practice test:
If one car travels 24mph in one direction and then turns around and goes back to its original location at a speed of 48mph, what is the cars average speed?
The CD-rom did not give me the correct answer.
Thank you for your help. I'm going bald from stress. Only 3 weeks and 1 day till the real thing!!!
QR125: The ratios are equal between men and woman. Then the number of men decreases by 20% and the number of woman increases by 20%. What is the current ratio of men to woman?
I got 2/3 for this but it says the correct answer is 3/2. Do I have the ratio concept backwards or is this an error?
QR140: What is the equation of the line of symmetry of the equation:
x^2 = 4(y+2) - 16
The correct answer is x=0
Do we need to know parabola stuff, because I don't really know it that well.
QR152: The temperature for the first week of the month of January were recorded as follows: 5, 10, 15, 8, 13, 17, 9. What is the mean and standard deviation of the set of data?
Correct answer is 11 and 3.9.
My question is how and I supposed to determine standard deviation? I understand how to get mean, but am so lost with standard deviation.
I also have another question from my Kaplan Blue Book CD-Rom practice test:
If one car travels 24mph in one direction and then turns around and goes back to its original location at a speed of 48mph, what is the cars average speed?
The CD-rom did not give me the correct answer.
Thank you for your help. I'm going bald from stress. Only 3 weeks and 1 day till the real thing!!!