You are Here: Home

S1 exam question - normal distribution Tweet

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

Announcements Posted on
TSR launches Learn Together! - Our new subscription to help improve your learning 16-05-2013
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. S1 exam question - normal distribution
http://i45.tinypic.com/34hjs5d.png
In part c, where did the 0.5244 come from?
2. Re: S1 exam question - normal distribution
The percentage points table, for 0.3
3. Re: S1 exam question - normal distribution
Your link isn't opening on my computer but the value of 0.3 in your tables would give you a z value of 0.5244...
4. Re: S1 exam question - normal distribution
You're doing what you did in (b) but for P(X>172) = 0.3

... I think.

I did S1 last year and doing S2 this year... S2 is all normal distribution.
5. Re: S1 exam question - normal distribution
(Original post by Spellstheend)
The percentage points table, for 0.3

(Original post by mathswiz:))
Your link isn't opening on my computer but the value of 0.3 in your tables would give you a z value of 0.5244...
Oh of course! Thank you!