My Math Forum Statistics

 March 27th, 2018, 02:33 PM #1 Member   Joined: Mar 2017 From: Israel Posts: 85 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: 2,467 Thanks: 1342 I'm getting a z-value of -1.95996 for p=0.025. check your look up. Thanks from IlanSherer
March 27th, 2018, 03:40 PM   #3
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Joined: Mar 2017
From: Israel

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Quote:
 Originally Posted by romsek I'm getting a z-value of -1.95996 for p=0.025. check your look up.

I'm sorry, you're right, the value is -1.95996
I solved again, and the maximum weight is 480.4, right?

 March 27th, 2018, 03:53 PM #4 Senior Member     Joined: Sep 2015 From: USA Posts: 2,467 Thanks: 1342 yep Thanks from IlanSherer

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