Statistics
posted by Anesia .
A statistician believes that in her town each child born has a 50% chance of being a girl, independently of all other children. There are 281 threechild families in her town; 39 of these families have no girls, 94 have one girl, 115 have two girls, and the remaining 33 have three girls.
1) If the statistician’s belief is correct, the probability that a threechild family in the town will have exactly one girl is ______%.
2) If the statistician’s belief is correct, then among the threechild families in the town what is the expected number of families that have exactly one girl?
3) If the statistician’s belief is correct, then among the threechild families in the town what is the expected number of families that have no girls?

4) The Pvalue of the appropriate test is about ________%.