A certain manufacturer makes energy ecient LED light bulbs. After many years of product testing, the company knows that the average lifetime of these light bulbs is bell-shaped with a mean of 60,000 hours and a standard deviation of 8,000 hours.

1. What is the probability that a randomly selected light bulb has a lifetime between 56,000 and 62,000 hours?
2. What is the probability that the lifetime of a randomly selected lightbulb is less than 58,000 hours?
3. What percent of individual light bulbs last at least 50,000 hours? Answer as a percent to two decimal places.
4. Determine the number of hours by which 80% of the bulbs will have stopped working. Round two decimal places.

In 2018, 23.1% of internet-using adults purchased groceries online. Among those adults who purchased groceries online, 60% purchased their groceries from Amazon.

1. What is the probability that a randomly selected internet-using adult did not purchase groceries online?
2. What is the probability that a randomly selected internet-using adult purchased groceries online and from Amazon?