Can any one help me with this? It is a practice question in my algebra book and I cant figure it out.
"In a given population, the weight of newborn humans are normally distributed about the mean, 3250 g. The standard deviation is 500 g. Find the probability that a baby chosen random weighs from 2250 g to 4250 g.
Step 1-
Find the z-scores of the lower and upper limits.
z1=2250-3259/500=-1000/500=-2
z2=4250-3250/500=1000/500=2

Thanks!

Question

Can any one help me with this? It is a practice question in my algebra book and I cant figure it out. 
"In a given population, the weight of newborn humans are normally distributed about the mean, 3250 g. The standard deviation is 500 g. Find the probability that a baby chosen random weighs from 2250 g to 4250 g.
     Step 1-
Find the z-scores of the lower and upper limits.
z1=2250-3259/500=-1000/500=-2    
z2=4250-3250/500=1000/500=2

Thanks!

perl · Answer

did you have a question about the z score

anonymous · Answer

I dont understand what the z-score is and how to find it