Question

Help Please! =/

Find the number z such that the proportion of observations that are less than z in a standard Normal distribution is 0.7. Mark your choice below.

Answer 1

http://en.wikipedia.org/wiki/Standard_normal_table#Cumulative_table

z= 0.525

Answer 2

what number did you look up on the table to get .525?

Answer 3

0.7 which represents area under curve

Answer 4

its not exact since table only uses z values to 2 decimal places

Answer 5

if you want a more exact answer, type this formula into Excel:
'NORMSINV(0.7)"