The following Python code demonstrates how to calculate the mean and standard deviation of an array using NumPy:
import numpy as np
# Create an array
arr = np.array([10, 20, 30, 40, 50])
# Calculate and print the mean
mean = np.mean(arr)
print('Mean:', mean)
# Calculate and print the standard deviation
std_dev = np.std(arr)
print('Standard Deviation:', std_dev)