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#1 2006-01-01 03:25:17
- morik
- Member
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Hows about a little help here
Hey guys,
Got a few questions here. I know they are probably no more than GCSE standard but still, I need and appreciate the help.
The scenario is I work for a computer repair company.
1. During January, the following faults were recorded
Number Fault
100 Hard Disk Drive
300 Power Supply
150 Operating System
200 Video Card
180 Wiring
30 Nil
Express each fault occurrence as a percentage of the total number of faults.
2. During the year the following numbers of computers were received for repair
Jan - 960
Feb - 900
Mar - 800
Apr - 750
May - 600
Jun - 650
Jul - 600
Aug - 400
Sep - 600
Oct - 800
Nov - 200
Dec - 150
1. What is the total number of computers received for repair?
2. What is the mean number received per month?
3. What is the median of the data above?
4. What is the mode of the data above?
Thanks for your time.
Morik
#2 2006-01-01 06:04:19
- John E. Franklin
- Star Member
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Re: Hows about a little help here
Is the Nil Fault an actual fault or a service call that was fixed some other way?
Do we count the Nil ones?
In second question, what does "mode" mean?
Imagine for a moment that even an earthworm may possess a love of self and a love of others.
#3 2006-01-01 07:28:36
- mathsyperson
- Moderator
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Re: Hows about a little help here
The mode is the most common number. Here, it is 600 because it appears three times. I'm quite surprised you didn't know that, John. 
For the rest of 2:
1. Just add up all of the numbers for each month.
2. Take your answer to 1) and divide it by 12 (the number of months)
3. Arrange the numbers in order and pick the middle one. Here, that is halfway between the 6th and 7th ones, so just take the mean of those.
4. As above, it is 600 because it is the most common.
Why did the vector cross the road?
It wanted to be normal.
#5 2006-01-01 16:15:28
- John E. Franklin
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Re: Hows about a little help here
Nil 3.125%
because 30 / (100+300+150+200+180+30) = 0.03125
Move decimal over two to the right to make a percent. .03125 is then 3.125% or 3 and 1/8 percent.
Imagine for a moment that even an earthworm may possess a love of self and a love of others.