My Math Forum A question I am stuck on

 Probability and Statistics Basic Probability and Statistics Math Forum

 May 7th, 2018, 08:19 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,430 Thanks: 1315 this is all pretty straightforward let $\Phi(x)$ be the CDF of the standard normal distribution a) $P[t > 1.8] = 1 - \Phi\left(\dfrac{1.8 - 2.0}{0.5}\right)$ I leave it to you to do the arithmetic and table/software lookup. b) find $P[t < 2.5] - P[t < 1.5]$ c) find $t$ such that $\Phi^{-1}(0.99) = \dfrac{t-2.0}{0.5}$
 May 7th, 2018, 09:41 PM #3 Newbie   Joined: May 2018 From: Australia Posts: 3 Thanks: 0 how come a) and c) have red font with yellow background and say "undefined control sequence \dfrac ?
May 7th, 2018, 10:16 PM   #4
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From: USA

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Quote:
 Originally Posted by Alex87 how come a) and c) have red font with yellow background and say "undefined control sequence \dfrac ?
looks ok to me. Maybe you can't contact the LaTex rendering server?

 May 8th, 2018, 08:09 AM #5 Newbie   Joined: May 2018 From: Australia Posts: 3 Thanks: 0 maybe..... ahhh this is all to confusing for me lol
May 8th, 2018, 08:29 AM   #6
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Joined: Sep 2015
From: USA

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Quote:
 Originally Posted by Alex87 maybe..... ahhh this is all to confusing for me lol
you still can't see it?

b) Find P[t < 2.5] - P[t < 1.5]

c) Find t such that

Phi^{-1}(0.99) = (t-2)/(0.5)

This site works much better if your pc can render the LaTex.

No one else is having trouble with it as far as I know.

 Tags question, stuck

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