
Concept explainers
(a)
To find: The probability that all the four units are good.
(a)

Answer to Problem 47E
The probability that all the four unit is good is
Explanation of Solution
Given:
The number of microwave oven is
Calculation:
The number of perfect ovens is,
After the first perfect units of oven is delivered than the number of perfect unit is 8 and the total number of unit is 11.
The instant after which the second perfect unit is sold the number of perfect unit left is
Thus, the probability that all the four unit sold is good is,
(b)
To find: The probability that only two units are good.
(b)

Answer to Problem 47E
The probability that only the two unit is good is
Explanation of Solution
Given:
The number of microwave oven is
Calculation:
The number of perfect ovens is,
After the first perfect units of oven is delivered than the number of perfect unit is 8 and the total number of unit is 11.
The instant after which the second perfect unit is sold the number of perfect unit left is
The total number of oven than is twelve and the defective units are
As, if the first bad unit is deliveredthan the bad unit chosen left is two and the total number of units let is
Thus, the probability that only two unit sold is good is,
The probability that only two of the unit is good is
(c)
To find: The probability that at least units are good.
(c)

Answer to Problem 47E
The probability that at least the two unit is good is
Explanation of Solution
Given:
The number of microwave oven is
Calculation:
The number of perfect ovens is,
After the first perfect units of oven is delivered than the number of perfect unit is 8 and the total number of unit is 11.
The instant after which the second perfect unit is sold the number of perfect unit left is
The total number of oven than is twelve and the defective units are
As, if the first bad unit is delivered than the bad unit chosen left is two and the total number of units let is
Thus, the probability that at least two unit sold is good is,
The total way of selecting the four units is,
Then, the probability of selecting at least two perfect unit is,
Chapter 9 Solutions
Precalculus with Limits
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