A consumer survey indicates that the average household spends m=$155 on groceries each week. The distribution of spending amounts is normal with a standard deviation of o=$25. Based on this distribution
a. What proportion of the population spends more than $150 per week on groceries?
b. What is the probability of randomly selecting a family that spends less than $110 per week?
c. How much money do you need to spend each week to be in the top 10% of spenders