Question

430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours

Answer 1

\[x = \frac{\sum x}{n} = \frac{224}{430} = 0.521 = 52.1\%\]

Answer 2

Pulled from here: https://docs.google.com/viewer?url=http%3A%2F%2Fdnn.epcc.edu%2FPortals%2F114%2FSection%2520six%2520one%2520and%2520two.pdf