Question

A brand of light bulbs has a mean lifetime of 1,500 hours and a standard deviation of 150 hours. A sample of 100 light bulbs gave a mean lifetime of 1,400 hours. What is the margin of error for the sample?

Answer 1

Answer:

15

Step-by-step explanation:

Given that:

Mean (μ) = 1500

Standard deviation (σ) = 150

Sample size = 100

Mean (m) = 1400

Margin of Error of sample :

Standard deviation / √sample size

σ / √n

150 / √100

150 / 10

= 15