Solution:
Given that;
The amount of 5th and 6th graders is normally distributed with a mean of 4 inches and standard deviation of 1 inch.
To find the percentage of 5th and 6th graders that grows between 1 and 3 inches, we will apply the z score formula

Where, x = 1 inch

Where, x = 3 inches

Using the z score table,
![P(-3For the 5th graders, the percentage is[tex]=0.15731*100\%=15.731\%](https://img.qammunity.org/2023/formulas/mathematics/college/hxxbosw4sa2rz1xvh0vlu7ttxsrj0ztucs.png)
For the 6th graders, the percentage is the same as the percentage of the 5th graders.
The percentage of the 6th graders is

The percentage of 5th and 6th graders that grows between 1 and 3 inches will be
Since, they have different peaks, it is not appropriate to use normal distribution.
Hence, the answer is A