11. a certain alloy contains 14.25% nickel. how much nickel is there in a piece weighing 375 pounds? round your answer to the nearest hundredth.
a. 112.49 pounds
b. 12.24 pounds
c. 53.44 pounds
d. 78.92 pounds

12. theresa worked 9 hours on monday and 7 hours on wednesday. her total pay was $116.00. what is her rate per hour?
a. $16.57
b. $8.29
c. $7.25
d. $12.89

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean