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March 27th, 2018, 02:33 PM  #1 
Member Joined: Mar 2017 From: Israel Posts: 70 Thanks: 2  Statistics
Hello Can you help me please about the next exercise: In a pastry shop which bakes cheese cakes whose weight with normal distribution. The average of weight is 500 grams and a standard deviation is 10 grams. The pastry shop donates 2.5% of the cakes with the lowest weight. What is the maximum weight of a donated cake? My solution: 2.5% = 0.025 In table of Z, 0.025 = 2.8 Therefore, the maximum weight of a donated cake is 472. Right? I'm not sure if I solved correctly, because I didn't understand the explanation of my lecturer about the same subject. Thanks! 
March 27th, 2018, 03:22 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,976 Thanks: 1026 
I'm getting a zvalue of 1.95996 for p=0.025. check your look up. 
March 27th, 2018, 03:40 PM  #3 
Member Joined: Mar 2017 From: Israel Posts: 70 Thanks: 2  
March 27th, 2018, 03:53 PM  #4 
Senior Member Joined: Sep 2015 From: USA Posts: 1,976 Thanks: 1026 
yep


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