给定两个数组用np库求其均值，方差，标准差，协方差

import numpy as np
arr = [100,98,87,65,82,99,92,99,100]
arr1 =[35,34,30,24,28,35,32,34,35]
#求均值
arr_mean = np.mean(arr)
#求方差
arr_var = np.var(arr)
#求标准差
arr_std = np.std(arr,ddof=1)
#求协方差
arr_cov=np.cov(arr1,rowvar=False)
print(“平均值为：%f” % arr_mean)
print(“方差为：%f” % arr_var)
print(“标准差为:%f” % arr_std)
print(“协方差为:%f” % arr_cov)