Answer: <u>7.5 pounds</u> of chocolate are needed to make 48 signature chocolate muffins.
Step-by-step explanation:
Given : The amount of chocolate needs for each muffin = 2.5 ounces
Then , the amount of chocolate needs for 48 muffins will be :-

Since , 
Then , 
Then , the amount of chocolate are needed to make 48 signature chocolate muffins (in pounds) will be :-

Hence, 7.5 pounds of chocolate are needed to make 48 signature chocolate muffins.