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stats help needed...

Mathematics
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i need help with part A
i dont know what to do after i get the z-score... which is -0.966 (when rounded)

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Other answers:

like what is the next step? i have the zscore and i have the graph drawn out (68-95-99.7)
You look it up in the z-table. Sorry I'm bad at stat, hang around while help comes.
  • phi
look in you z table for the area above -0.966 std dev. it looks like about 83 %
can you show me the work? im confused on the last steps
like how would i solve it without using Excel or something like that
  • phi
You would use a z-table or calculator Do you use a table ?
i dont know what a z table is to be frank
  • phi
Here is a site that does the conversion http://www.tutor-homework.com/statistics_tables/statistics_tables.html How are you doing these problems?
this is the first one like this on my hw
  • phi
your book must talk about how to do this?
  • phi
but to do a) select standard distribution (the first one shown) right tail type in -0.966 for z and have it calculate the area under the curve to the right of that z score. that is the chance the weight is above this z score
any way this can be done on a graphing calc rather than on this site?
  • phi
if it knows about normal distributions (do they?) otherwise http://en.wikipedia.org/wiki/Normal_distribution#Numerical_approximations_for_the_normal_CDF is a (messy) way
using normal since ur z score is -0.966 round to 2 decimal u'll have -0.97 it means u'll have P(z>=-0.97) because it is over 1050 u'll have 1-P(Z<=-0.97) on the z table -0.97 it hase the probability of 0.1660 now 1-(0.1660) 0.834 wich by conclusion is 83.4%
do u get it?
yeah i get everything except the part where i get the 0.1660. i dont know how to get it without using the site Phi gave me above. ^^^
http://www.tutor-homework.com/statistics_tables/statistics_tables.html
check this tables
do u see -0.97 ?
yes i get that by doing the formula for z score and rounding
do u see the value that correspond to it ?
not really no. i dont get how that part works.
|dw:1348601547745:dw| the deshes represents some numbers on the table ;right
yeah. i just dont know how i get this table to see the probability.
to find this 0.1660 take -0.9 ignore negative (meaning u gonna take 0.9)then add it to 0.07 wich will give positive 0.97 from there where -0.9 intersects 0.07 is ypur probability
do u follow?
yes i get that. i dont know how to get that table though.
what do you mean you dont know how to get the table?
do u mean u don't have the table
yes
check the attechement skbmt it has tables
@mariomintchev mahlatse posted them
thanks
u r welcome

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