The proportion of public accountants who have changed companies within the last three years is to be estimated within 5%. The 95% level of confidence is to be used. A study conducted several years ago revealed that the percent of public accountants changing companies within three years was 24. (Usez Distribution Table.)(Round the z-values to 2 decimal places. Round up your answers to the next whole number.)

a.To update this study, the files of how many public accountants should be studied?