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QUESTION:

The graph below displays four normal distributions labeled (a) through (d).


A parabola graph with an X axis only.  The range on the X axis is 10-40.  This graph shows four curves labelled a, b, c, and d.  Curve a starts at 10, with a peak at 20, and a decline that ends at 30.  Curve b starts at about 18, with a peak at 25, and a decline that ends at about 32.  Curve c starts at about 26, with a peak at 30, and a decline that ends at 40.


Suppose that distribution (b) is a normal distribution with mean μ=25 and standard deviation σ=2. 

Based on this information, answer the following questions.

03

Question 3

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What is the mean of distribution d? 

ANSWER:

30

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