Given , what is the probability of P(X<9) ?

I have no clue how to do it...

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- January 26th 2009, 07:02 AMFaisal2007Mini prob. question
Given , what is the probability of P(X<9) ?

I have no clue how to do it... - January 26th 2009, 07:05 AMgalactus
Am I to assume that u is for the mean and

o is for the standard deviation?.

If so,

If x=9, then z=-1.

What is the z score for -1?. - January 26th 2009, 07:08 AMFaisal2007
Is it 0.15?

Why did you find the z score though ? - January 26th 2009, 11:54 AMmr fantastic
- January 27th 2009, 05:29 AMFaisal2007
- January 27th 2009, 12:18 PMmr fantastic
Surely you're told the distribution! What is the context of the question? Is it a question from a problem set on normal distribution? Binomial distribution ....?

If you can't provide all the necessary background information to the question you're not going to get much help.