A total of 300 observations of Bob Ramos, an assembly-line worker, were made over a 40-hour work week. The sample also showed that Bob was busy working (assembling the parts) during 250 observations.
(a) The percent of time Bob is working = % (enter your response as a percentage rounded to two decimal places).
(b) The number of observations that need to be taken of Bob to be 95% confident with 3% acceptable error = (round your response to the immediate higher whole number).