Posted by **Ashley** on Thursday, November 15, 2012 at 6:35pm.

The average amount of time people spend on facebook each day is 71 minutes, with a standard deviation of 4.7 minutes. Are you more likely to select a random person that spends less than 68 minutes per day, or a group of 35 people that spend on average less than 65 minutes per day on facebook? Assume this is normally distributed. Find the chances of each to decided which is more likely by how much.

- Statistics -
**PsyDAG**, Saturday, November 17, 2012 at 9:22pm
For the individual,

Z = (score-mean)/SD

For the group,

Z = (score-mean)/SEm

SEm = SD/√n

For both, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.

## Answer This Question

## Related Questions

- statistics - The average amount of time people spend on facebook each day is 71 ...
- Statistics - The average time a visitor spends at the Renzie Park Art Exhibit is...
- Stat - Suppose that a principal of a local high school tracks the number of ...
- Statistical work - Suppose that a principal of a local high school tracks the ...
- stat - ** I already finish these questions Can you answer so I can compare my ...
- Stat - Does anyone know how to solve for this Suppose that a principal of a ...
- Algebra 2 - A simple random sample of 50 adults was surveyed, and it was found ...
- statistics - Bill spends an average of 5 minutes each day waiting in lines. If ...
- Dine - Men spend an average of 29 minutes per day on weekends and holidays ...
- math - Tia generated a list of random numbers to simulate an experiment based on...

More Related Questions