Question

Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The proportion of infants with birth weights below 125 oz is:

A. .500

B. .159

C. .341

D. .841

Answer 1

Answer:

125 is 1 dev above, so it's  13.5 + 2.35,

so it's B. 0.159

And i think the proportion of infants with birthweights between 125 oz and 140 oz is :

D. 0.136