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Maths and statistics discussion, revision, exam and homework help.

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1. jobs?
what can you do with just a highschool diploma?
Last edited by molotowsky; 17-05-2012 at 02:16.
2. Re: A couple statistics questions.. can anyone help with these?
Have you studied the normal distribution and how to use the probability tables? For most questions, drawing the curve out makes everything much easier until you no longer need to.

Remember:
-it is symmetrical
-the total area under the curve (total probability) is 1
-the mean of the standard normal distribution is 0, and its standard deviation is 1
Last edited by Implication; 16-05-2012 at 21:42.
3. Re: A couple statistics questions.. can anyone help with these?
1. The standard dev for the standard normal curve is 1, so "within 2 standard deviations of z= 1.37" means
P( 1.37-2x1 < Z < 1.37+ 2x1)
= P(1.37-2 < Z < 1.37+2)
Calculate using the tables...

2. Have you done a sketch of the area. It's equivalent to a probability statement using 1.38.
3. Use tables to find a probability closest to 0.63. What is the corresponding z-value?
4. Re: A couple statistics questions.. can anyone help with these?
I dont think I'm reading the tables properly.. I'm not getting any of the options for the questions, could you explain the steps in solving these questions please...
5. Re: A couple statistics questions.. can anyone help with these?
(Original post by molotowsky)
I dont think I'm reading the tables properly.. I'm not getting any of the options for the questions, could you explain the steps in solving these questions please...
just out of interest, why have you changed your original question?
6. Re: jobs?
I didn't figure out how to ask a new question! I meant to ask this as a new question not delete my old one I'm not good with this site
7. Re: jobs?
(Original post by molotowsky)
I didn't figure out how to ask a new question! I meant to ask this as a new question not delete my old one I'm not good with this site
but this is the second thread you did it on, why did you not just post a new thread? As the question you asked was so obviously nothing to do with the new question.