USE 2 DECIMALS TO REPORT X VALUES
USE 4 DECIMALS TO REPORT P VALUES
SHOW YOUR WORK
Given a set of normally distributed scores with = 20 and a = 6, what percentage of scores is…
24.5 or higher?
between 10.13 and 28.55?
20 or lower?
Between 22 and 25?
What z score(s) corresponds to…
the 40tth percentile?
the 65th percentile?
The 70th percentile?
The middle 50%?
The middle 60%?
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?
