Answer
The null hypothesis cannot be rejected and this means that the average acreage of farms has not changed.
Work Step by Step
Given that, $\mu=65, \sigma=7, n=22, \bar x =63.2$, then,
$H_{0}:\mu=65.\\ H_{1}:\mu \ne 65.$
$Z=\frac{\bar x- \mu}{\frac{\sigma}{\sqrt{n}}}=\frac{63.2- 65}{\frac{7}{\sqrt{22}}}\approx -1.21$
$P-value =2\times(1-P(Z\leq 1.21)=2\times(1-0.8869)=0.2262$
Since $\alpha=0.10$ and $P-value =0.2262$, the null hypothesis cannot be rejected.
