Question

what is the difference of the means of the distributions?
15
30
45
60

Explanation:

Step1: Identify the mean of blue - distribution

The blue distribution seems to be centered around 20, so we assume its mean $\mu_1 = 20$.

Step2: Identify the mean of red - distribution

The red distribution seems to be centered around 50, so we assume its mean $\mu_2=50$.

Step3: Calculate the difference of the means

The difference $\Delta\mu=\mu_2 - \mu_1$. Substituting the values, we get $\Delta\mu = 50 - 20=30$.

Answer:

30