In a survey of first graders, their mean height was 49.9 inches with a standard deviation...
In a survey of first graders, their mean height was 49.9 inches with a standard deviation of 3.15 inches. Assuming the heights are normally distributed, what height represents the first quartile of these students? 46.75 inches 47.77 inches 52.02 inches 43.60 inches
Homework Answers
Find the z value with left tail of 25%:
Z= -0.6745.
Let x is a randon number represent height and normally distributed with mean =49.9 inches and standard deviation = 3.15 inches.
Height represent the first quartile of these students:
X = -0.6745 * SD + Mean
X = -0.6745 * 3.15 + 49.9
X = 47.77
So, the correct answer is 47.77 inches.
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