the mean of normally distributived test scores is 81 and the standard deviation is 3. if there are 172 test scores in the data sample, how many of them were in the 81 to 87 range

Alana needs to carve out a specific monthly budget for herself and keep to it. She could make use of the envelope method to do so. She has to work enough to earn at least $600 in one month, that would take care of her expenses (rent, food, transport etc) that come out to be $524.

Step-by-step explanation:

Alana needs to be more aware of her spending pattern, only then will she be able to save a certain amount of money on a monthly basis. Creating a cash flow statement will help her in this regard.