A politician wants to know what percentage of the voters support her position pn the issue of forced busing for integration. What size voter sample should be obtained to determine with 90 % confidence the support level to within 4%?

Given that 10% of the nails using a certain manufacturing process have a length less than 2.48 inches, while 5% have a length greater than 2.54 inches, what are the mean and the standard deviation of the lenghts of the nails ? Assume that the lenghts have a normal distribution.

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