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yashar806

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mathgeek!

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a)

yashar806

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how?

tomo

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|dw:1363388359595:dw|

tomo

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so we want to find that inside probability. so like the last problem we need to find two z scores.

yashar806

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where did you get that 3 and 5 ?

tomo

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mean mu my bad

tomo

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|dw:1363388474676:dw|

yashar806

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ok

yashar806

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you mean i have to look up z score between -1 to 1 ?

yashar806

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hello?>

tomo

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yeah, one sec

yashar806

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are you there?

tomo

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yeah, I'm just a bit confused.

tomo

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right now I think that we need to do
1-z1-z2
z1 = (y-mu)/(sigma)
the top y value i think is mu+1. sigma is 4.
z1 = (mu+1-mu)/4 = 1/4
now for y2
the bottom y value i think is mu-1. sigma is 4.
z2 = (mu -1-mu)/4 = -1/4
so 1 -1/4 + 1/4 = 1
but its not an answer, which confuses me.