A Random Sample of 15 Telephone Calls in an Office

question 17

Short Answer

A random sample of 15 telephone calls in an office showed the duration of each call and whether it was a local or a long distance call.
$\begin{array}{ccc}&\text { Duration }\\\text { Call Number } & \text { In Minution } &\text { Type of Call }\\1 & 2 & \text { local } \\2 & 12 & \text { long distance } \\3 & 10 & \text { local } \\4 & 3 & \text { local } \\5 & 5 & \text { long distance } \\6 & 6 & \text { local } \\7 & 3 & \text { local } \\8 & 5 & \text { local } \\9 & 8 & \text { local } \\10 & 4 & \text { local } \\11 & 5 & \text { local } \\12 & 4 & \text { local } \\13 & 5 & \text { local } \\14 & 4 & \text { local } \\15 & 9 & \text { long distance }\end{array}$
a. What is the point estimate for the average duration of all calls?
b. What is the point estimate for the standard deviation of the population?
c. What is the point estimate for the proportion of all calls that were long distance?

Grasp the concept of comorbidity in developmental disorders.

Understand the legal and educational strategies for children with special needs.

Recognize the significance of early health habits and physical activity on long-term well-being.

Comprehend the impact of BMI and obesity on child health.

---

Definitions:

Protestant North America

Regions in North America where Protestant Christianity is a dominant religious influence, reflecting in the culture and society.

Caribbean Island

Islands in the Caribbean Sea, noted for their diverse cultures, histories of colonialism, and roles in the African diaspora.

England

A country in Europe that is part of the United Kingdom, known for its rich history, monarchy, and contributions to culture and science.

John Hawkins

A 16th-century English naval commander and slave trader, notable for his role in the early years of the Atlantic slave trade.