New here with statistics problem/finding percentiles

bosshossgirl

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Joined
Nov 5, 2011
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Hello anyone reading this. The advisor I have at school recommended your site and it looks very informative and helpful. I am in Statistics and it is a basic class. I am in week 3 and barely keeping my head above water. I need help with some DQ's and I want to pass the class but also understand the concepts when I come out of it. I understand the basica like max/med/min and so on but chapter 1 went into chapter 2 and I was lost pretty much at the beginning. I am an online student and have nowhere to go for help.
Im hoping that someone can help me with this example...and the steps to get the answer correct. Any advice or references would be very appreciated!
Kindest regards,
Michele


Find the approximate cost of room and board corresponding to each of the following percentiles:
  1. 30th percentile =
  1. 50th percentile =
  1. 75th percentile =
  1. 90th percentile


Room and board costs for selected schools are summarized in this distribution.
Costs (in-dollars)
Frequency
3000.5-4000.5
5
4000.5-5000.5
6
5000.5-6000.5
18
6000.5-7000.5
24
7000.5-8000.5
19
8000.5-9000.5
8
9000.5-10000.5

5














 
Total number of observations is: ??

30% if this number is: ??
50% if this number is: ??
etc.
 
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