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http://answers.yahoo.com/question/index;_ylt=Av9cFK0v6Qp4KyuPkXdjgdTsy6IX;_ylv=3?qid=20110511030451AAUtAn3 link wont work?
no guess not. lets try this.. I'm not sure I need mid-points here but I believe I do.
This is a statistics problem about finding expectation value and standard deviation from a frequency distribution. The distribution is a range of ages. Starting at Under 13, next to 13-14, and continuing onwards 15-19, 20-24, etc. up until 60-64 and Over 65.
The Age groups are for # of AIDS cases. For ex Under 13 has 9112 AIDS cases. - Don't I need an Upper Class Limit/Boundary for 65? Or am I thinking too deeply into this?
THE QUESTIONS ARE: Is this a normal distribution, why? and Find the standard deviation and expectation value from the frequency distribution. Also, if an age is selected at random, what is the probability it is between 22 and 47?
AGE - AIDS CASES
00-12 - 9112
13-14 - 1065
15-19 - 5289
20-24 - 34795
25-29 - 114141
30-34 - 193926
35-39 - 208505
40-44 - 164697
45-49 - 102732
50-54 - 56950
55-59 - 30424
60-64 - 16493
65+ - 14503
Any help reminding me how this is put together and organized would be appreciated. This is for Final Review and I haven't done this since the beginning of the semester so I forgot most of it.
i think you can get help from here