[content70]

A consumer survey indicates that the average household spends µ = $155 on groceries each week. The distribution of spending amounts to approximately normal with a standard deviation of σ = $25. Based on this distribution:

a. What proportion of the population spends more than $175 per week on groceries?
b. what probability of randomly selecting a family that spends less than $100 per week on groceries?
c. How much money do you need to spend on groceries each week to be in the top 20% of the distribution?

[morgaine300]

Have you made any attempt on this yet? If so, please post it and someone can check it, because this is pretty much like an entire chapter's worth of explanation.

I did spend quite a bit of time on an example on one thread, and there's some other info on the other thread:

https://www.askmehelpdesk.com/math-s...le-392066.html
https://www.askmehelpdesk.com/math-s...ty-390595.html