Instruction 7.3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 116

Essay

Instruction 7.3
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken.
-Referring to Instruction 7.3,the probability is 0.15 that the sample mean lifetime is more than how many hours?

---

Definitions:

Symbolic Immortality

The notion that one can achieve immortality through lasting contributions to society, leaving a legacy, or being remembered by others.

Organ Donations

The process of donating one's organs or tissue to be transplanted into another person in need, often to save or significantly improve the recipient's life.

Religious People

Refers to individuals who follow and practice a specific set of beliefs, rituals, and moral codes based on the teachings of a religion.

Symbolic Immortality

The concept of achieving a sense of perpetuity beyond one's death through contributions to society, remembrance by others, or through creations or offspring.