According to the National Center for Health Statistics, 8% of 20-to 34-year-old females have high serum cholesterol. In a random sample of 10 females 20 to 34 years old: In a random sample of 250 females 20 to 34 years old, what is the standard deviation for the group with high serum cholesterol?​

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?