Probability Question Help
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 This topic has 2 replies, 3 voices, and was last updated 14 years, 11 months ago by Van Loon.

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June 8, 2007 at 12:49 am #47204
Please Help! Show computation if possible. Thanks
Answer the following questions:
A Standardized test has a mean of 90 with a standard deviation of 5.
1. If you had a score of 95 on a standard test. What is the probability of observing a score of 95 on this test?
2. Another individual had scored 100 on the same test. What is the probability of an individual obtaining a score between 95 and 100?
3. What is the probability of an individual failing this text, given that any score below a Z= 3 would fail?0June 8, 2007 at 3:26 am #157164It looks like you’re taking an introductory course to psychology. I won’t give you the answer but some hints.
Mean = 95, standard deviation = 5, score = 95, look up the zvalue at 1.67.
Score between 95 and 100 is the difference between the cumulative probability at 1.96 (100 score) and 1.67 (95 score), i.e. the difference between 1 and 2 standard deviations above the mean.
Look up the cumulative distribution at the zvalue of 3, that will give you that answer.0June 12, 2007 at 10:50 am #157299If it is continous data, you cant give the probalility for
exact the number 95, can you ?
Jan0 
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