Laboratory rats commit an average of µ= 40 errors before they sole a standardized maze problem. The
Question: A consumer survey indicates that the average household spends µ= $155 on groceries each week. The distribution of spending amounts is 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 is the 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?
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