Estimate the number of newborns whose weight was less than 4001 grams.   (b) Estimate the number of newborns whose weight was greater than 1484 grams. (c) Estimate the number of newborns whose weight was between 3162 and 4840 grams.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 3GP
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A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of 777 babies born in New York. The mean weight was 3162 grams with a standard deviation of 839 grams. Assume that birth weight data are approximately bell-shaped.

(a) Estimate the number of newborns whose weight was less than 4001 grams.  

(b) Estimate the number of newborns whose weight was greater than 1484 grams.

(c) Estimate the number of newborns whose weight was between 3162 and 4840 grams.

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Follow-up Question

For part (a) - how did you get the answer 0.8414? 

Is there rule? I understand the There is approximately 

68% that falls within 1 standard deviation, but about it.
 
Can you please show me the how you got the answer for 0.8414?
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