WorksheetsExam 3 Review
Total questions: 20
Worksheet time: 25mins
Find the mean of the random variable X.
2
6
1
4
Find the standard deviation of the random variable X.
2
3
7
9
Find the missing value that makes the following a valid probability distribution.
1
-0.8
0.19
0.4
The following table presents a probability distribution for the number of pets each family has in a certain neighborhood. Find the probability that a randomly selected family has 1 or 2 pets.
0.2
0.4
0.1
0.5
The following table presents a probability distribution for the number of pets each family has in a certain neighborhood. Find the probability that a randomly selected family has no more than 3 pets.
0.9
0.4
0.1
0.2
At a cell phone battery plant, 5% of cell phone batteries produced are defective. A quality control engineer randomly collects a sample of 50 batteries from a large shipment from this plant and inspects them for defects. Using binomial distribution, find the probability that exactly 2 batteries are defective.
0.3
0.4
0.2611
0.05
What does this symbol mean?
Population Mean
Sample Mean
Sample Standard Deviation
Population Variance
What does this symbol mean?
Sample Proportion
Sample Mean
Sample Standard Deviation
Population Variance
Which formula do you use to find the standard deviation of a sample mean?
σ
nσ
μ
np(1−p)
Which formula do you use to find the standard deviation of a proportion?
σ
nσ
μ
np(1−p)
The mean and standard deviation of a population are 400 and 40, respectively. Sample size is 25.
What is the standard deviation of the sampling distribution?
400
40
25
8
What does this formula do?
Calculates Standard Deviation for Sampling Dist. of Sample Means
Checks if the samples are independent
Checks Normality
Calculates Standard Deviation for Sampling Dist. of Sample Proportions
The National Coffee Association reported that 70% of U.S. adults drink coffee daily. A random sample of 300 U.S. adults is selected. Find the standard deviation σp
0.70
230
0.0264
0.0483
The National Coffee Association reported that 70% of U.S. adults drink coffee daily. A random sample of 300 U.S. adults is selected. Find the mean.
0.70
68
0.0264
0.0483
