Statistics help

  • Thread starter xargon
  • Start date
  • #1
3
0
Hi,

This is not a physics question. However, I was hoping someone could help me.

A call centre sets a quality target of answering the telephone within 30 seconds. The results of monitoring show a normal distribution with an average answer time of 28 seconds and a standard deviation of 2 seconds.
question: what percentage of customers are still being kept waiting too long?

Thanks,

xargon
 

Answers and Replies

  • #2
551
1
1 SD to the right of the mean is 30 s. I think you need to work out P(Z < 30) and take that away from 1, though I can't remember how to do that.
 
  • #3
599
1
about 68% of the area of the normal distribution lies between minus 1 sd and plus sd from the mean. So I think you can find the answer from there by yourself...
 

Related Threads on Statistics help

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
17
Views
2K
  • Last Post
Replies
1
Views
984
  • Last Post
Replies
0
Views
4K
  • Last Post
Replies
6
Views
3K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
2
Views
913
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
1K
Top