The Cheebles cookie factory changed their recipe. The inspectors took a sample of the new cookies and

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Question:

The Cheebles cookie factory changed their recipe. The inspectors took a sample of the new cookies and found that the mean weight of the sample was 42 grams with a standard deviation of 4 grams. The Cheebles CEO specifically asked the inspectors to use these statistics to find the lower and upper boundary weights of 50% of their cookies

What are the Z values of the limits of the area covering the middle half of the area under the normal curve that the inspectors would use to find this information for the CEO of Cheebles?

From -0.674 to 0.674

From -1.00 to 1.00

From -0.680 to 0.680

From 0 to 1.00