http://www.ck12.org Chapter 5. The Shape, Center and Spread of a Normal Distribution - Basic
4. 47.5%
5. 48.85%
Answer Key for Review Questions (even numbers)
(b) 68% of the plants have a height between 11.15 cm and 11.65 cm.
0. 68 (x) = 225x=225
0. 68
x= 331Therefore there were 331 strawberry plants in the greenhouse.
(c)
99 .7% − 95%= 4 .7%
x
x
All plants plants with
within 3σ heights greater
from mean. than 10.9 cm
4 .7%
2= 2 .35%
331 × 0. 0235 =8 plantsTherefore, eight plants in the greenhouse would be shorter than 10.9 cm.
- (a)