Is what I have for my answers correct?

A marketing researcher for a phone company surveys 134 people and finds that the proportion of customers who are likely to switch providers when their contract expires is 18%. Complete parts a) and b) below. a) What is the standard deviation of the sampling distribution of the proportion? SD (P) = 0.0270 (Round to four decimal places as needed.) b) If she wants to reduce the standard deviation by half, how large a sample would she need? 776 (Type a whole number.)