Why do i get an error?

Question

import numpy as np
import random

a = random.randint(10, 100, 10)
range = np.max(a) - np.min(a)
mean = np.mean(a)
std1 = np.std(a)

print("The range is " + str(range))
print("The mean and standard deviation of the distribution are " + str(mean) + " and " + str(std1) + ".")

Answer 1

The randint() method of the random module only takes 2 arguments: low and high.

The numpy module includes the random.randint() method which takes low and high and size (and dtype, default is int).

So to fix your code:
dont bother with 'import random'
just change
'random.randint('
to
'np.random.randint('