could someone work out and explain the answer of 'P(Z>a)=0.2000'

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Its under S1, chapter 9, Thank you

Posted Thu 4th April, 2013 @ 17:41 by Cymbeline

2 Answers

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!st of all in you need to know what 'a' is in the question it should say what the probability is; 

for example : 

Each time i use a spinner the probability of getting a 2 is 1/4 

given that X~Geo(1/4) 

P(X>6) = (3/4)^6                  *(3/4 is the probability of not getting {1-P} )

= 729/4096 = 0.178 

i hope that u can use this example to answer your question 

im afraid i cant help unless i no the full question **

Answered Sun 7th April, 2013 @ 13:43 by Emilyxoxo<3
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p(z<a)=0.2

use the tables to see which value comes closest to 0.2

answer is 0.84 on the negative side

Answered Sun 7th April, 2013 @ 14:14 by .