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:

  1. 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.
  2. 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:

  1. How does the standard deviation affect the shape of a normal distribution?
  2. What is the relationship between the mean and the median in a symmetric normal distribution?
  3. How would you calculate the mean and standard deviation from a given dataset?
  4. What is the probability of a data point lying within one standard deviation of the mean in a normal distribution?
  5. 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.

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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