A club has 50 members. If there is a 10% absentee rate per meeting, find mean and standard deviation: How do you do the problem step by step
You need more data to find the standard deviation, but the mean attendance would be 50 - .1(50).
I searched Google under the key words "standard deviation" to get these possible sources:
http://en.wikipedia.org/wiki/Standard_deviation
http://www.robertniles.com/stats/stdev.shtml
http://davidmlane.com/hyperstat/A16252.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
To find the mean and standard deviation of the number of absences per meeting, you can follow these steps:
Step 1: Calculate the number of members absent per meeting:
- The absentee rate is given as 10%. So, 10% of 50 members would be absent.
- To calculate the number of members absent, multiply 10% by 50.
Absentee count = 0.10 * 50 = 5 members
Therefore, on average, we can expect 5 members to be absent per meeting.
Step 2: Calculate the mean (or average) of the number of absences per meeting:
- Since the number of absences is constant (5 members), the mean is simply equal to the number of absences.
Mean = 5
The mean here represents the average number of absences per meeting.
Step 3: Calculate the standard deviation:
- To calculate the standard deviation, we need to find the variation from the mean.
- Since the number of absences is constant, there is no variation; thus, the standard deviation is zero.
Standard deviation = 0
In this case, the standard deviation is zero because all the values are the same.
Therefore, the mean (average) number of absences per club meeting is 5, and the standard deviation is 0.