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To create a box plot in Matplotlib that includes two summary statistics, you can follow the steps below:

1. Import the necessary libraries:

import matplotlib.pyplot as plt
import numpy as np

1. Create your dataset:

data1 = np.random.normal(50, 10, 100)
data2 = np.random.normal(70, 5, 100)

1. Combine the two datasets:

data = [data1, data2]

1. Set the labels for each dataset:

labels = ['Dataset 1', 'Dataset 2']

1. Create the box plot using the boxplot() function:

fig, ax = plt.subplots()
ax.boxplot(data, vert=False, labels=labels, showmeans=True, meanline=True)

Here, vert=False makes the plot horizontal, labels adds the labels we created in step 4, showmeans=True and meanline=True show the mean values and a line indicating the mean.

1. Display the plot:

plt.show()

This will create a box plot with two datasets, labeled and with the mean values shown.