Banking fees have received much attention during the recent economic recession as banks look for ways to recover from the crisis A sample of 45 cusfomers paid an anirage fee of $12.07 per month an their interest-bearing checking accounts. Assump the population standard deviation is $1.81. Complete parts a and b belowe a. Construct a 90% confidence interval to estimate the average fee for the populasion The 90% confidence interval has a lower limit of 5 and an upper limh of (Round to the nearest cent at needed) b. What is the margin of error for this interval? (Round to the nearest cent as needed)