
Mean and Standard Deviation from Probability Distribution
Authored by Anthony Clark
Mathematics
12th Grade

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20 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The amount of fuel used by jumbo jets to take off is normally distributed with a mean of 4000 gallons and a standard deviation of 125 gallons. What is the probability that the mean number of gallons of fuel needed to take off for a randomly selected sample of 40 jumbo jets will be less than 3950 gallons?
.0057
.025
.345
.781
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Suppose the teenagers that attend public high schools get an average of 5.7 hours of sleep each night with a standard deviation of 1.7 hours. What is the probability that a randomly selected group of 35 high school students get more than 6 hours of sleep each night?
.430
.148
.281
.087
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The mean and standard deviation of a population are 400 and 40, respectively. Sample size is 25.
What is the mean of the sampling distribution?
400
40
25
8
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The mean and standard deviation of a population are 400 and 40, respectively. Sample size is 25.
What is the standard error of the sampling distribution?
400
40
25
8
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Following is the probability distribution for the age of a student at a certain public high school.
Find the standard deviation of the probability distribution
1.52
1.26
1.87
1.71
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean and the standard deviation.
μ = .4; σ = 7.5
μ = 2.5; σ = 1.1
μ = 3; σ = 1.3
μ = .1; σ = 0
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does this symbol represent?
Median
Variance
Standard Deviation
Mean Absolute Deviation
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