Concept explainers
(a)
To find: The
(a)
Answer to Problem 68E
Solution: The mean and standard deviation of the binomial random variable X is 900 and 15 respectively.
Explanation of Solution
Calculation: In binomial distribution, the mean can be calculated by this formula,
In binomial distribution, standard deviation can be calculated by this formula,
Where, n is the number of trials and p is the probability of success in a trial. For
The standard deviation is calculated as:
Hence, the average value and standard deviation are 900 and 15 respectively.
(b)
To find: The probability.
(b)
Answer to Problem 68E
Solution: The probability is
Explanation of Solution
Calculation: The binomial random variable approximately follows the
Therefore, the random variable X can be approximated to normal distribution because the given condition is fulfilled.
The parameters of the normal distribution are calculated as follows:
And:
The probability that the value taken by X is greater than or equal to 800, the area right to the point 800 under the normal curve. To obtain the area lying to the left of a point under the normal curve, first, convert the value of the variable into Z-score and then obtain the area lying to the right by subtracting the area left to the Z-score from 1. The Z-score for the value
The area left to the particular Z-score can be obtained using Excel by using the command
The area left to the Z-score,
So, the required probability can be calculated as:
Hence, the probability is 1.
(c)
To find: The probability.
(c)
Answer to Problem 68E
Solution:
Explanation of Solution
Calculation: For the probability that more than 950 candidates will accept the admission, Excel has to be used. The following procedure is followed in Excel:
Step 1: Open the Excel spreadsheet.
Step 2: Type the command
Therefore, the required probability is calculated as:
Hence, the probability is 0.0003.
(d)
To find: The probability.
(d)
Answer to Problem 68E
Solution:
Explanation of Solution
Calculation: The probability that more than 950candidates will accept the admission, Excel has to be used. The following procedure is followed in Excel:
Step 1: Open the Excel spreadsheet.
Step 2: Type the command
Therefore, the required probability is calculated as:
Hence, the probability is 0.9408.
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Chapter 5 Solutions
EBK INTRODUCTION TO THE PRACTICE OF STA
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