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hi aric, where mu is the mean (340) sigma is the sd (45) and phi is the function that converts this into a probability. Use this page: http://www.mathsisfun.com/data/standard … table.html This interactive graph shows the probabilities as percentages in three possible ways. Click the 'up to z' button to get the 7% area you want. There is a more accurate table of values below the graph. Once you have z, you can solve for x Bob
Hi aric;
Hi aric
What is the zscore for "7%"?
Hi aric
birth weight in US are normally distributed with mean of 340g and a strandard deviation of 45g. If a hospital plans to set up observation condition for the lightest 7% of the babies, what weight is used for the cutoff separating the lightest 7% from the others? 