Free Exam: STAT 324-Second Midterm Exam-First Semester 1430 - 1431 H
Number of Questions in Test: 30
Number of Questions in Preview: 5
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[size=4]A man had, in the stock, 4 bulbs of 100 watts and 2 bulbs of 60 watts. He randomly picks 3 bulbs together from the stock. Let X be the number of 60 watt bulbs selected.[/size]
[size=4]The probability that X = 1 is:
[/size]
[size=4]The probability that X = 1 is:
[/size]
| Type: | Multiple response |
| Points: | 1 |
| Randomize answers: | Yes |
Question 2
[size=4]A man had, in the stock, 4 bulbs of 100 watts and 2 bulbs of 60 watts. He randomly picks 3 bulbs together from the stock. Let X be the number of 60 watt bulbs selected.[/size]
[size=4]The probability that X is at least 2 is:[/size]
[size=4]The probability that X is at least 2 is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 3
[size=4]A man had, in the stock, 4 bulbs of 100 watts and 2 bulbs of 60 watts. He randomly picks 3 bulbs together from the stock. Let X be the number of 60 watt bulbs selected.
[/size]
[size=4]The expected number of 60 watts bulbs is:[/size]
[/size]
[size=4]The expected number of 60 watts bulbs is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 4
[size=4]A man had, in the stock, 4 bulbs of 100 watts and 2 bulbs of 60 watts. He randomly picks 3 bulbs together from the stock.
[/size]
[size=4]The variance for the number of 60 watts bulbs is:[/size]
[/size]
[size=4]The variance for the number of 60 watts bulbs is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 5
[size=4]The probability that a certain brand of a bulb survives beyond 3 years is 0.8. The lives of three bulbs are observed.
The probability that all of the bulbs will survive beyond 3 years, is:[/size]
The probability that all of the bulbs will survive beyond 3 years, is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |