Based on estimation, it should be the fourth choice. Hope this helps!!!
Answer:
The first quartile of the IQ scores of adults is 82.26.
Step-by-step explanation:
The first quartile is the value that is greater than 25% of the observations and less than 75% of the observation.
The formula to compute the first quartile (Q₁) of a Normal distribution is:

The mean and standard deviation of the IQ scores of adults are:

Compute the first quartile value as follows:

Thus, the first quartile of the IQ scores of adults is 82.26.
You mean the house is 30.5 feet long correct?
30.5 / 25 = 1.22 feet
Therefore, the model is 1.22 feet long.