Asked by Kelly
a) The average height of sunflowers in a field is 64 inches with a standard deviation of 3.5 inches. Describe a normal curve for the distribution, including the values on the horizontal axis at one, two, and three standard deviations from the mean.
b) If there are 3,000 plants in the field, approximately how many will be taller than 71 inches?
b) If there are 3,000 plants in the field, approximately how many will be taller than 71 inches?
Answers
Answered by
PsyDAG
a) Do you mean above or below the mean or both?
Z = (score-mean)/SD
Insert Z scores (±1, ±2 and/or ±3) into above equation and calculate.
b) Same equation.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. Multiply by 3,000.
Z = (score-mean)/SD
Insert Z scores (±1, ±2 and/or ±3) into above equation and calculate.
b) Same equation.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. Multiply by 3,000.
Answered by
Kelly
Thank you sooooooo much
Answered by
PsyDAG
You are welcome.
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