
Probability and Statistics Basic Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
December 6th, 2014, 02:35 AM  #1 
Newbie Joined: Dec 2014 From: Ireland Posts: 1 Thanks: 0  Problem finding what the rate stands for
Hello people, I'm doing a data project on heart surgery. I have the data but I can't figure out what the rate means. For example there's one hospital which performed 6,865 heart surgeries. Of these, 234 resulted in the patient dying. The data says this is a mortality rate of 136.0. But it doesn't say what that rate is. Is it per 100 cases? Per 1000? I've done maths for these but they didn't turn out right. However, I wouldn't be surprised if I did something wrong. Anyone able to help? Thanks 
December 6th, 2014, 03:17 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,727 Thanks: 688 
The answer is 3.4%. The text should explain how it got their number.

December 6th, 2014, 05:07 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,280 Thanks: 1023 
Simpler example: 6000 operations : 240 died 240/6000 = .04 = 4% 
December 7th, 2014, 04:20 AM  #4 
Math Team Joined: Apr 2010 Posts: 2,780 Thanks: 361 
136/3.4% = 4000, so 136.0 of about 4000 patients having heart surgery died. Maybe about 4000 heart surgeries/year/hospital on average?


Tags 
finding, problem, rate, stands 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
How do you do this rate problem?  davedave  Calculus  2  May 6th, 2014 01:26 AM 
Finding an expression for Instantaneous rate of change  alyssa jesse  Calculus  3  October 6th, 2013 01:21 AM 
Rate problem  daigo  Calculus  4  July 10th, 2012 11:11 AM 
Finding the rate of change  tsl182forever8  Calculus  1  March 2nd, 2012 03:19 PM 
a man can run...(rate problem)  warqzaka  Algebra  6  July 21st, 2011 04:23 PM 