Answer
$\mu$= 140 dollars, σ = 30dollars, n = 25 households
$\mu$ = $\mu$ _${\bar{x}}$= 140 dollars
σ_${\bar{x}\ }$ = $\frac{30}{\sqrt 25}$ = 6 dollars
The sampling distribution has a greater extent of normal distribution since it has a smaller standard deviation compared to the population distribution. In other words, the spread in the sampling distribution is smaller.
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