Question 921798
given: an average of 28 pounds

a.
Find  {{{z}}} values corresponding to {{{27}}} and {{{31}}}:


{{{z=(27-28)/2=-1/2=-0.5}}}

{{{z=(31-28)/2=3/2=1.5}}}


Find the area between {{{z = -0.5}}} and {{{z= 1.5}}}

Table E gives us an area of {{{0.9332-0.30=0.6247}}}=> The probability is {{{62.47}}}%

b.

Find {{{z}}} values corresponding to {{{30.2}}}

{{{z=(30.2-28)/2=2.2/2=1.1}}}  Find the area to the right  of {{{z =1.1}}}

it gives you an area of {{{0.1357}}}=> The probability is {{{13.57}}}%