Math Problem Statement
Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers.
A normal bell curve labeled Upper A and a normal elongated curve labeled Upper B are centered at the same point. Normal curve Upper B is narrower and above normal curve Upper A.
Select all that apply:
A has the larger mean.
B has the larger mean.
The means of A and B are equal.
A has the larger standard deviation.
B has the larger standard deviation.
The standard deviations of A and B are equal.
Solution
From the description of the two normal distributions:
-
A and B are centered at the same point, meaning that their means are equal. So, the correct statement is:
- The means of A and B are equal.
-
B is narrower and taller, while A is wider. This suggests that B has a smaller standard deviation (because narrower distributions have smaller standard deviations), and A has a larger standard deviation (because wider distributions have larger standard deviations). So, the correct statement is:
- A has the larger standard deviation.
Therefore, the correct answers are:
- The means of A and B are equal.
- A has the larger standard deviation.
Would you like more details or have any questions?
Here are 5 related questions that expand on the concept:
- How does the standard deviation affect the shape of a normal distribution?
- What is the relationship between the mean and the median in a symmetric normal distribution?
- How would you calculate the mean and standard deviation from a given dataset?
- What is the probability of a data point lying within one standard deviation of the mean in a normal distribution?
- How do z-scores relate to the standard deviation in a normal distribution?
Tip: A narrower distribution indicates that data points are more concentrated around the mean, meaning a smaller standard deviation.
Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Statistics
Normal Distributions
Standard Deviation
Mean
Formulas
Standard Deviation Formula: σ = sqrt(Σ(x - μ)² / N)
Mean Formula: μ = Σx / N
Theorems
68-95-99.7 Rule for Normal Distributions
Properties of Normal Distribution Curves
Suitable Grade Level
Grades 10-12
Related Recommendation
Identifying Normal Distributions and Comparing Variation in a Set of Curves
Identifying Normal Distributions and Comparing Standard Deviations in Three Curves
Analyzing Two Normal Distributions: Means Differ by 5 Units with Equal Standard Deviations
Comparing Standard Deviations of Two Normal Distributions
Understanding Normal Distribution: Comparing Means and Standard Deviations