Approximate the side length of each square below.
Estimate side lengths to the nearest tenth.

C. 68%  

Step-by-step explanation:

We have been given that the numbers of cookies in a shipment of bags are normally distributed, with a mean of 64 and a standard deviation of 4.

Let us find z-score for our given raw scores 60 and 68 using z-score formula.

, where,  

z= z-score.

x= Raw score.

= Mean.

= Standard deviation.

Therefore, 60 is 1 standard deviation below mean.

Now let us find z-score for 68.

Therefore, 68 is 1 standard deviation above mean.

We can see that 60 and 64 lies between z=-1 and z=1.

Since empirical rule states that 68% of data falls within the first standard deviation from the mean, therefore, 68% of cookie bags will contain between 60 and 68 cookies and option C is the correct choice.