# Question: a study of 605 queensland car drivers found that 88...

###### Question details

A study of 605 Queensland car drivers found that 88 of them were under the influence of drugs while driving. Use the survey results to estimate, with 90% confidence, the proportion of Queensland car drivers under the influence of drugs while driving. Report the upper bound of the interval only, giving your answer as a percentage to two decimal places. Use z table, not cas calculator.