Answer:
z(s) is in the acceptance region we accept H₀. We don´t have enough evidence to support the breeder´s claim
Step-by-step explanation:
We will test the breeder´s claim at 95% ( CI) or significance level 
α = 5 %   α = 0,05    α /2 = 0,025
Sample Information:
sample size   n  = 45
sample mean   x  = 72,5 pounds
Sample standard deviation  s = 16,1 
1.-Hypothesis Test:
Null Hypothesis                              H₀        x  =  70
Alternative Hypothesis                  Hₐ        x  ≠  70
Alternative hypothesis contains the information about what kind of test has  to be developed ( in this case it will be a two-tail tets)
2.-z (c) is from z-table     z(c) = 1,96
3.- z(s)  =  ( x - 70 ) / 16,1 / √45
z(s)  =  (72,5 -70 ) *√45 / 16,1
z(s)  = 2,5 * 6,71 / 16,1
z(s)  = 1,04
4.-Comparing  z(s) and z(c)
z(s)  <  z(c)
Then z(s) is in the acceptance region we accept H₀. We don´t have enough evidence to support the breeder´s claim