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July 10th, 2011, 02:49 AM  #1 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Probability question
1.The probability that a heart patient survives after surgery in a country is 0.85. a)Find the probability that,out of five randomly chosen heart patients undergoing surgery,four survive. b)Using suitable approximation distribtuion,find the probability that more than 160 suvive after surgery in a randmo of 200 heart patient. I need help with this question. I use P(x=4) to solve part (a) but can't give the actual answer.And i am not sure what type of probability is it.I need help.Thank you. 
July 10th, 2011, 04:35 AM  #2  
Senior Member Joined: May 2011 Posts: 501 Thanks: 6  Re: Probability question Quote:
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Since they ask the probability of "more than 160", we use a continuity correction. Use 160.5 . Now, look this up in the z table.  
July 10th, 2011, 05:00 AM  #3 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Re: Probability question
Thank you very much.I have refer to the z table i find that P Q Z 0.970 0.30 1.881 So,the probability is 0.97.Right? 
July 10th, 2011, 06:17 AM  #4 
Senior Member Joined: May 2011 Posts: 501 Thanks: 6  Re: Probability question
Yep.


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