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Unformatted text preview: 7  What is the probability that the standard normal variable, z, is between .57 and 1.98? 8.  Calculate the probability that the class average test score is between 72 and 79. The number of students taking the exam is 64 and the test score mean=75 and the standard deviation=20. 9.  Calculate the 95% confidence interval for the population mean using the following data: x 9 6-1 2 5 7 3 9 10.  The mean price of purchases is $110 and the standard deviation=$12. What is the probability of a purchase exceeding $90? 11.  Calculate the 99% confidence interval for the population proportion of liberal donors to charity. A sample of 160 liberals indicates 48 donated. 12  Calculate the 95% confidence interval for the population mean. A sample of 81 had a sample mean=320 and standard deviation=25....
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