It was reported that 63% of individual tax returns were filed electronically in 2012. A random sample of 175 tax returns from 2013 was selected. From this sample, 123 were filed electronically. Complete parts a through c below. a. Construct a 90% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2013. b. A 90% confidence interval to estimate the actual proportion has a lower limit of ___ and an upper limit of ___(Round to three decimal places as needed.)