<PRE><B>Question 215090</B>
The average yearly cost per household of owning a dog is $186.80. Suppose that we randomly select 50 households that own a dog. What is the probability that the sample mean for these 50 households is less than $175.00? assume o=$32 
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Find the z-value of 175.00:
z(174) = (175-186.80)/[32/sqrt(50)] = -11.80/[4.5255] = -2.6075
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P(x &lt; 175) = P(z &lt; -2.6075) = 0.00456
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Cheers,
Stan H.





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