This is the picture of the parallelogram
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<h2>Answer with explanation:</h2>
As per given , we have
n= 64
a) Since , the sample mean is the point estimate for the population mean.
Therefore, the point estimate of the population mean =
b) Critical z-value for 99% confidence :
Confidence interval :
Hence, the 99 percent confidence interval for the population mean is between 7.46 and 8.88.