Question 855430
m = 6.5
s = 1.21
z = (x-m)/s
x = 8.9
z = (8.9-6.5)/1.21 = 2.4/1.21 = 1.98
p(z < 1.98) = .9761 from the following z-score table
<a href = "http://lilt.ilstu.edu/dasacke/eco148/ztable.htm" target = "_blank">http://lilt.ilstu.edu/dasacke/eco148/ztable.htm</a>
p(z > 1.98) = 1 - .9761 = .0239
out of 80 babies, .0239 * 80 = 1.912 are expected to be over 8.9 pounds.