totals and averages

import math
def basic_math():
    if command in mean:
        n = int(input("How many data do you have?: "))
        total = 0
        for count in range(n):
            data = int(input("Enter data number "+str(count)+":"))
            total+=data
        result=total/n
        print("the average of ",n,"numbers is: "+str(result))
    elif command in addition:
        n = int(input("How many data do you have?: "))
        total = 0
        for count in range(n):
            data = int(input("Enter data number "+str(count)+":"))
            total+=data
        result=total
        print("the addition of ",n,"numbers is: "+str(result))
    elif command in multiplication:
         n = int(input("How many data do you have?: "))
         product=1
         for count in range(n):
            data = int(input("Enter data number "+str(count)+":"))
            product*=data
         result=product
         print("the product of ",n,"numbers is: "+str(result))
    else:
         n = int(input("How many data do you have?: "))
         sumsquares=0
         sum=0
         for count in range(n):
            data = int(input("Enter data number "+str(count)+":"))
            sumsquares+=data*data
            sum+=data
            avg=sum/n
         result=sumsquares/n-avg
         result=math.sqrt(result)
         print("the standard deviation of ",n,"numbers is: "+str(result))
finished=False
while finished==False:
    print("Hi, I am Khamisi, your personal bot.")
    addition=["sum","add","plus","total","+"]
    multiplication=["multiply","times","*","product"]
    mean=["average","arithmetic mean","avg"]
    sd=["standard deviation","sd"]
    command=input("choose operation: ")
    if command in mean:
        basic_math()
    elif command in addition:
        basic_math()
    elif command in multiplication:
        basic_math()
    elif command in sd:
        basic_math()
    else:
        finished=True
        print("Sorry I don't understand this")