Areas Under the Curve for any Normal Distribution 99.7% 95.4% 68.3% M – 30 H – lo µ + lo M + 3ơ M– 20 10 30 50 70 60 40 20 70 60 50 30 20 10 20 60 70 50 30 10 10 20 30 50 60 70

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
Problem 34CR
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A random variable is normally distributed with a mean of μ = 40 and a standard deviation of σ = 10.
 
(a) The following figure shows that the normal curve almost touches the horizontal axis at three standard deviations below and at three standard deviations above the mean (in this case at 10 and 70).
 
Sketch a normal curve for the probability density function. Label the horizontal axis with values of 10, 20, 30, 40, 50, 60, and 70.
 
(b) What is the probability the random variable will assume a value between 30 and 50? (Round your answer to three decimal places.)
 
(c) What is the probability the random variable will assume a value between 20 and 60? (Round your answer to three decimal places.)
 
Areas Under the Curve for any Normal Distribution
99.7%
95.4%
68.3%
M – 30
H – lo
µ + lo
M + 3ơ
M– 20
Transcribed Image Text:Areas Under the Curve for any Normal Distribution 99.7% 95.4% 68.3% M – 30 H – lo µ + lo M + 3ơ M– 20
10
30
50
70
60
40
20
70 60
50
30
20
10
20
60
70
50
30
10
10
20
30
50
60 70
Transcribed Image Text:10 30 50 70 60 40 20 70 60 50 30 20 10 20 60 70 50 30 10 10 20 30 50 60 70
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