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Statistics help please
- Thread starter kimdun
- Start date
D
Deleted member 4993
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Suppose the average age of a passenger train car is 19.1 years. If the distribution of ages is normal and 20% of the cars are older than 21.5 years, find the standard deviation. Round final answer to two decimal places.
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I know that first I take .2000-.5000=3000 then I get stuckYou need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:
http://www.freemathhelp.com/forum/th...217#post322217
We can help - we only help after you have shown your work - or ask a specific question (not a statement like "Don't know any of these")
Please share your work with us indicating exactly where you are stuck - so that we may know where to begin to help you.
D
Deleted member 4993
Guest
I know that first I take .2000-.5000= - .3000 then i get stuck
How did you get those numbers?
Did you study z-distribution?