An astronomer observes 500 objects and classifies them as either of type A or type B. She finds 148 objects to be of type B. Assuming a binomial distribution, the best estimate of the fraction of type A objects and its associated standard deviation respectively are
1
0.704, 0.002
2
0.70, 0.02
3
0.704, 0.031
4
0.72, 0.03