SOLUTION: A biology class did a survey of an open field for the number of visible insects per square ft. of ground. The results were normally distributed. The mean was 28 insects and the sta

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Question 390610: A biology class did a survey of an open field for the number of visible insects per square ft. of ground. The results were normally distributed. The mean was 28 insects and the standard deviation was 5. What values are 1 standard deviation from the mean?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Use the z-score formula:
z+=+%28X+-+mu%29%2Fsigma. Hence we want
+/-1+=+%28X+-+28%29%2F5, or +/-5 = X - 28, or X = 23, 33.