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IlanSherer March 27th, 2018 02:33 PM

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
https://profile.fcdn.co.il/images/0__05abac541c2160.jpg
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!

romsek March 27th, 2018 03:22 PM

I'm getting a z-value of -1.95996 for p=0.025.

check your look up.

IlanSherer March 27th, 2018 03:40 PM

Quote:

Originally Posted by romsek (Post 590865)
I'm getting a z-value of -1.95996 for p=0.025.

check your look up.

Thanks for answering :)

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

romsek March 27th, 2018 03:53 PM

yep


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