Concept explainers
Medical: Blood Type Blood type AB is found in only 3% of the population (Reference: Textbook of Medical Physiology, by A. Guyton, MD). If 250 people are chosen at random, what is the probability that
(a) 5 or more will have this blood type?
(b) between 5 and 10 will have this blood type?
(a)
To find:
The probabilitythat 5 or morewill have the blood type AB.
Answer to Problem 15CR
Solution:
The probabilitythat 5 or morewill have the blood type AB is 0.8665
Explanation of Solution
Calculation:
We have random variable x having a normal distribution with mean
Now, the mean is
And standard deviation will be
Now, we calculate
By using formula for normal distribution:-
By using Table 3 from appendix:
The probability 5 or more that will have blood type AB is 0.8665.
(b)
To find:
The probabilitythat between 5 and 10 will have blood type AB.
Answer to Problem 15CR
Solution:
The probability that between 5 and 10 will have blood type AB is 0.7330.
Explanation of Solution
Calculation:
We have random variable x having a normal distribution with mean
Now, we calculate
Now, mean and standard deviation are as
Further,
Thus, the desired probability is 0.7330.
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Chapter 7 Solutions
Understanding Basic Statistics
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