Question

Find the standard deviation for the given sample data. Round your answer to one more decimal place than is present in the original data. The manager of an electrical supply store measured the diameters of the rolls of wire in the inventory. The diameters of the rolls (in meters) are listed below. 0.402 0.23 0.569 0.317 0.23 0.543 0.492 Mario's weekly poker winnings have a mean of $140.69 and a standard deviation of $29.79. Mario's winnings from last week correspond to the z-score of -1.76. How much did he win last week, in dollars? Round your answer to two decimal places. A student earned grades of 83, 69, and 83 on her three regular exams. She earned a grade of 79 on the final exam and 88 on her course project. Her combined homework grade was 93. Each of the three regular tests counts for 12% of the overall grade, the final exam counts for 16%, the project counts for 10%, and homework counts for 38%. What is her weighted mean grade? Round your answer to two decimal places

Answer 1

Xi	(xi - u )	(xi - u )^2
0.402	0.004429	1.96122E-05
0.23	-0.16757	0.028080184
0.569	0.171429	0.029387755
0.317	-0.08057	0.006491755
0.23	-0.16757	0.028080184
0.543	0.145429	0.021149469
0.492	0.094429	0.008916755
		0.122125714