Based on the empirical rule (also called the 68-95-99.7 rule) what part of all possible values occur between -3 and +1 standard deviations?

A. 68%

B. 95%

C. 99.7%

D. 83.85%

E. None of the above

A sample of 177 randomly selected students, found that the proportion of students planning to travel home for Thanksgiving is 0.64.

what is the standard deviation of the sampling distribution?

round to to 3 decimal digits.