A Laptop Battery Lifespan Follows a Normal Distribution with Mean $\sigma$

question 17

Multiple Choice

A laptop battery lifespan follows a normal distribution with mean μ = 20 months and a standard deviation $\sigma$ = 6 months.To test the alternative hypothesis that μ > 20 with α = .05, 36 laptop batteries are randomly selected.Assuming that μ = 21, the power of this is approximately ________.

• A)0.00
• B)0.2595
• C)0.2036
• D)0.6449
• E)0.7405

---

Definitions:

Complex Fraction

A fraction where the numerator, the denominator, or both contain fractions.

Simplify

The process of expressing something in a more comprehensible or simpler form, in mathematics, typically reducing an expression to its simplest form.

Expression

A combination of symbols that represent a mathematical object, such as numbers, variables, and operation symbols, but without an equals sign.

Complex Fraction

A fraction where the numerator, the denominator, or both contain fractions themselves.