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(a) In the given data of number of television viewing hours per houshold, the minimum value is =1& the maximum value is =15.Therefore, range of the given sample is -{:[" maximum value - minimum value "],[=15-1],[=14]:}Now, the range rule tells us-sd=(" Range ")/(4)quad[[" sd is the standard "],[" deviation of the data set "]]we should remember that, this formula is very rough for calculating sd.Then, sd=(14)/(4)=3.5(b) The formula of the sample mean and sample standard deviation is -Samplemean= bar(x)=(1)/(n)sum_(i=1)^(n)x_(i)quad&quad sample sd=sqrt((1)/(n-1)sum_(i=1)^(n)(x_(i)-( bar(x)))^(2))From the table above,{:[" sample mean "=(155.5)/(25)=6.22],[" sample sd "=sqrt(((1)/(25-1)xx293.54))],[=3.49726]:}In (a) the ... See the full answer