The Proportion of Junior Executives Leaving Large Manufacturing Companies Within

The proportion of junior executives leaving large manufacturing companies within three years is to
Be estimated within 3 percent. The 0.95 degree of confidence is to be used. A study conducted
Several years ago revealed that the percent of junior executives leaving within three years was 21.
To update this study, the files of how many junior executives should be studied?

A) 594
B) 612
C) 709
D) 897