Suppose in 2011 a survey of workers in the city of found that used public transport to commute to work. Give your answers to the following to two decimal places.

Part (a) Estimate the percentage of workers in who use public transport to commute to work. .

Part (b) Find a 95% confidence interval for the percentage of workers in using public transport to commute to work. Use the sample proportion in your estimate of the standard error. Provide the upper and lower bounds for your confidence interval. ( , )