Posted by GiNa on .
The weights of individual nails produced by the 'Hammer 'n Nail' hardware company follow a normal distribution with the average nail weight being 5.1 grams and the standard deviation in nail weight being 1.6 grams. When a nail is produced it is discarded if it weighs more than 8.268 grams. Calculate the probability that a randomly selected nail is not discarded. You may find this standard normal table useful. Give your answer as a decimal to 4 decimal places.
Probability =
ive calculated the z score to be 1.98 but i don't know what to do after this. Please help

statistics 
PsyDAG,
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score. In this case, you are looking for the "area in the larger portion."

statistics 
gInA,
but i cant find the proportion for a zscore of 1.98

statistics 
gInA,
on the table thingy... do i use 1.90 and 2??

statistics 
PsyDAG,
My "table thingy" has Z scores to two decimal places. If you have a 1.90 value, there should also be a 1.98 value. Use that.

statistics 
gina,
soo ive got the porpotion. Do i have to do anything with that or is that my answer???