Free Exam: Stat145-first term 31-32-second exam
Number of Questions in Test: 26
Number of Questions in Preview: 5
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[size=3]The researchers found that the amount of time children spent in upright position followed a normal distribution with mean of 5.4 hours and standard deviation of 1.3 hours. Find:
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[size=3]The probability that a child selected at random spend greater than 5.4 hours in upright position[/size]
[/size]
[size=3]The probability that a child selected at random spend greater than 5.4 hours in upright position[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 2
[size=3]The researchers found that the amount of time children spent in upright position followed a normal distribution with mean of 5.4 hours and standard deviation of 1.3 hours. Find:
[/size]
[size=3]The probability that a child selected at random spend less than 3 hours in upright position[/size]
[/size]
[size=3]The probability that a child selected at random spend less than 3 hours in upright position[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 3
[size=3]The researchers found that the amount of time children spent in upright position followed a normal distribution with mean of 5.4 hours and standard deviation of 1.3 hours. Find:
[/size]
[size=3]The probability that a child selected at random will spend between 3 and 5 hours is:[/size]
[/size]
[size=3]The probability that a child selected at random will spend between 3 and 5 hours is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 4
[size=3]The researchers found that the amount of time children spent in upright position followed a normal distribution with mean of 5.4 hours and standard deviation of 1.3 hours. Find:
[/size]
[size=3]The probability that a child selected at random will spend less than k hours is 0.9671. Then the value of k is:[/size]
[/size]
[size=3]The probability that a child selected at random will spend less than k hours is 0.9671. Then the value of k is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 5
[size=3]The researchers found that the amount of time children spent in upright position followed a normal distribution with mean of 5.4 hours and standard deviation of 1.3 hours. Find:
[/size]
[size=3]In a population of 10,000 children the number of children expected to be upright for more than 8.5 hours is:[/size]
[/size]
[size=3]In a population of 10,000 children the number of children expected to be upright for more than 8.5 hours is:[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |