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STAISTIC HELP! its driving me crazy! >:(

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Rozalin:
Q6) The weights of bags of popcorn are normally distributed with mean of 200 g and 60% of all bags weighing between 190 g and 2009.

A) Write down the median of the weight of the bags of popcorn. its 200g

I NEED HELP WITH THE FOLLOWING PART :-[
b) Find the standard deviation of the weights of the bags of popcorn

show ur working  :'(
thanks!  :D

I've attached the question paper, its from January 2008 S1 edexcel

Rozalin:
=__=

astarmathsandphysics:
should be 210g
P(200<w<210)=0.3 so P(w<210)=0.5+0.3
z corresponding to probability of 0.8 is 0.84
z=(x-u)/s
0.84=(210-200)/s=10/s
s=10/0.84=11.76

Rozalin:

--- Quote ---should be 210g
P(200<w<210)=0.3 so P(w<210)=0.5+0.3
z corresponding to probability of 0.8 is 0.84
z=(x-u)/s
0.84=(210-200)/s=10/s
s=10/0.84=11.76
--- End quote ---

Thankssssssss alooooooooooooot :DDD

but I have a question :$

--- Quote ---P(200<w<210)=0.3
--- End quote ---
From where did you get the 0.3? and the 0.5?

Rozalin:
and how did u get 0.84 @_@?

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