![]() Approximately what percentage of plants are greater than 26 inches tall?įirst, we will find the z-score associated with a height of 26 inches. The height of plants in a certain garden are normally distributed with a mean of μ = 26.5 inches and a standard deviation of σ = 2.5 inches. Next, we will look up the value 0.25 in the z-table:Īpproximately 59.87% of students score less than 84 on this exam. ![]() Step 2: Use the z-table to find the percentage that corresponds to the z-score. Approximately what percentage of students score less than 84 on the exam?įirst, we will find the z-score associated with an exam score of 84: The scores on a certain college entrance exam are normally distributed with mean μ = 82 and standard deviation σ = 8. This tutorial shows several examples of how to use the z table. A z-table is a table that tells you what percentage of values fall below a certain z-score in a standard normal distribution.Ī z-score simply tells you how many standard deviations away an individual data value falls from the mean.
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