In a distribution with = 85 and a = 6.45 …
what value of X separates the top 15% of the distribution?
what values of X separate the middle 60% of the distribution?
what value of X is the 25th percentile?
what values of X separate the middle 50% of the distribution?
A consumer survey indicates that the average house-hold spends μ = $185 on groceries each week. The distribution of spending amounts is approximately normal with a standard deviation of s = $25. Based on this distribution,
What proportion of the population spends more than $200 per week on groceries?
What is the probability of randomly selecting a family that spends less than $150 per week on groceries?
How much money—X value—do you need to spend on groceries each week to be in the top 20% of the distribution?
