Do social robots walk or roll? Refer to the International Conference on Social Robotics (Vol. 6414, 2010) study of the trend in the design of social robots, Exercise 7.67

(p. 371).

Recall that you used a 99% confidence interval to estimate the proportion of all social robots designed with legs but no wheels. How many social robots would need to be sampled in order to estimate the proportion to within .075 of its true value?