MO0NCHILDRM
Badges: 12
Rep:
?
#1
Report Thread starter 3 weeks ago
#1
P(−a<Z <a)=0.40 ⇒
P(−a<Z <0)=0.20 ⇒
P(−a < Z) = 0.30
⇒ −a = −0.52440...
⇒ a = 0.5244 (4 d.p.)

this is a standard normal distribution so Z-N(0,1^2)

i understand up until P(−a<Z <0)=0.20 , but then hpow does the 0.20 change to 0.3??
0
reply
mqb2766
Badges: 19
Rep:
?
#2
Report 3 weeks ago
#2
The inequality also flips. I guess it should be P(Z<-a) = 0.3? But it would help to see the original.
Can you sketch a bell curve and mark/shade the regions?
The total area under the curve is 1
Last edited by mqb2766; 3 weeks ago
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How do you prefer to get careers advice?

I like to speak to my friends and family (15)
12.82%
I like to do my own research online using careers specific websites (73)
62.39%
I like speaking to the careers advisors at school, college or uni (14)
11.97%
I prefer to listen watch videos or listen to podcasts of people in my chosen career (12)
10.26%
Something else (let us know in the thread) (3)
2.56%

Watched Threads

View All
Latest
My Feed