City-Data Forum Math idiot needs help with an equation..calling all math gurus....
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11-25-2011, 03:37 PM
 16,027 posts, read 17,810,319 times Reputation: 15806

Quote:
 Originally Posted by Dark of the Moon No, I didn't. It's .24%, not 24%. Not every percentage is a whole number.
sorry, I just saw .24 and assumed. I should have realized from the numbers given that you were correct.

11-25-2011, 06:28 PM
 Location: The Internet 355 posts, read 760,431 times Reputation: 426
Quote:
 Originally Posted by 20yrsinBranson Ok. In the United States there are 254,212,610 privately owned and registered vehicles; In the United States there are 223,877 privately owned and registered air craft in the year 2009 there were 33,808 motor vehicle fatalities, In the year 2009 there were 535 air craft fatalities. What I am trying to figure out is this.... Based on the respective number of licensed vehicles, what is the annual death rate (for 2009) for accidents. What is the percentage of people who are killed in each mode of transportation? OMG I don't even know where to begin on this. I am really, hopeless when it comes to any sort of math stuff. Your very kind and generous assistance is greatly appreciated. Thanks. 20yrsinBranson
Technically the way your question is worded, there is insufficient information to answer. You say: "In the United States there are 254,212,610 privately owned and registered vehicles and 223,877 privately owned and registered air craft." This is present tense and valid as of today only. However your fatality figures are given for the year 2009.

11-25-2011, 06:41 PM
 Location: Las Flores, Orange County, CA 26,346 posts, read 82,817,106 times Reputation: 17500
Quote:
 Originally Posted by 20yrsinBranson 1) what is the annual death rate (for 2009) for accidents. 2) What is the percentage of people who are killed in each mode of transportation?
There are two questions being asked. The number of vehicles is irrelevant for both questions.

1) Annual Death Rate is fatalities per year. It is independent of number of vehicles or airplanes.

So, 33808 auto fatalities per year and 535 air fatalities per year.

2) The percentage of people killed is 100*33808/total number of Americans and 100*535/total number of of Americans.

11-25-2011, 06:50 PM
 11,151 posts, read 14,118,155 times Reputation: 18795
Quote:
 Originally Posted by RottenChester Technically the way your question is worded, there is insufficient information to answer. You say: "In the United States there are 254,212,610 privately owned and registered vehicles and 223,877 privately owned and registered air craft." This is present tense and valid as of today only. However your fatality figures are given for the year 2009.
I agree.

However, I assumed that the relative number of vehicles and aircraft wouldn't change substantially in two years. Given the significant disparity between the two percentages (0.013% vs. 0.24%), there would have to be either a large increase in aircraft deaths or a large decrease in vehicle deaths for it to really make a difference.

11-25-2011, 07:30 PM
 16,568 posts, read 14,013,609 times Reputation: 20518
Quote:
 Originally Posted by Dark of the Moon I agree. However, I assumed that the relative number of vehicles and aircraft wouldn't change substantially in two years. Given the significant disparity between the two percentages (0.013% vs. 0.24%), there would have to be either a large increase in aircraft deaths or a large decrease in vehicle deaths for it to really make a difference.
I am not sure why the OP needed this information and for a "back of the napkin" calculation it is fine. But to know if there really is a "difference" you would need more statistical information.

11-25-2011, 08:21 PM
 11,151 posts, read 14,118,155 times Reputation: 18795
Quote:
 Originally Posted by lkb0714 I am not sure why the OP needed this information and for a "back of the napkin" calculation it is fine. But to know if there really is a "difference" you would need more statistical information.
I'm guessing it was one of those "you're safer in an airplane than a car" questions .....

11-25-2011, 08:51 PM
 16,568 posts, read 14,013,609 times Reputation: 20518
Quote:
 Originally Posted by Dark of the Moon I'm guessing it was one of those "you're safer in an airplane than a car" questions .....
Oh, ya, you are probably right.

I am a terribly literally thinker, a short falling of mine. I read those Narnia books a dozen times each before I got to college, NEVER got the overlying christian themes until they were pointed out to me. Duh.

11-26-2011, 06:14 AM
 Location: Summerville, SC 3,383 posts, read 7,106,707 times Reputation: 1441
Doublepost

11-26-2011, 06:15 AM
 Location: Summerville, SC 3,383 posts, read 7,106,707 times Reputation: 1441
Quote:
 Originally Posted by Dark of the Moon I'm guessing it was one of those "you're safer in an airplane than a car" questions .....
If it is, then its wrong. If not disregard.

You need numbers of how many people travel by car, and how many people travel by plane.

There are very few aircraft owners vs. Amount of people travel by air.

Example, just a quick sampling, does anyone in this thread own an airplane? Has anyone in this thread flown more then once? Do most people here own a car? The majority of the time are they the only passenger?

The numbers just show on average its safer to own a car then an airplane. Not any less safe to fly. The numbers are skewed. Need a more of an apples to apples comparison.

Sent from my autocorrect butchering device.

11-26-2011, 07:50 AM
 12,605 posts, read 28,027,153 times Reputation: 7140
This thread has been closed. Homework help is not usually allowed on this forum.
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