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WorksheetsStatistics - Practice Test
Total questions: 10
Worksheet time: 9mins
It can only take an infinite number of distinct values.
Continuous Random Variable
Discrete Random Variable
Normal Variable
Sample Variable
When mean = 0, and standard deviation = 1, it is called _________.
Continuous Normal Distribution
Discrete Normal Distribution
Sample Normal Distribution
Standard Normal Distribution
Which of the following is NOT considered a discrete probability distribution?
II and III only
I and IV only
I, III and IV only
I, II, III and IV
What is the standard deviation of the normal curve below?
3
4
5
6
Which of the following best describe the relationship of black and green normal curves?
same standard deviations, different means
same standard deviations, same means
different standard deviations, same means
different standard deviations, different means
Let X represent the number of times Molly goes to the cafeteria to eat in a one-week period. The probability distribution of X is shown above. What is the expected value?
3.21
3.31
4.21
3.17
Let X represent the number of times Molly goes to the cafeteria to eat in a one-week period. The probability distribution of X is shown above. What is the variance?
1.27
1.37
1.57
1.58
On a final examination in English, the mean was 86 and the standard deviation was 3.5. Assuming the scores are normally distributed, determine the standard scores of the students who received a score of 82.
1.14
-1.14
2.14
-2.14
You are provided with student B’s and student C’s explanation why the probability distribution below is not considered a discrete probability distribution.
Both explanations are correct.
Both explanations are in correct.
Student B’s explanation is incorrect, while Student C's explanation is correct
Student C’s explanation is incorrect, while Student B's explanation is correct
The teacher instructed them to find the area between
z = – 1.09 and z = 1.89. Here is a normal curve sketch and solution from student D. Is the sketch incorrect?
No, the sketch is correct.
No enough evidence to answer the question
Yes, because student D shaded the incorrect parts.
Yes, the sketch is incorrect because the z-scores are not properly labelled.
