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?

3 answers

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.

Thank you sooooooo much

You are welcome.