No output on running a program
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anoldmaninthesea 
I'm trying to solve the following challenge
https://www.hackerrank.com/challenges/s10-weighted-mean/problem?h_r=next-challenge&h_v=zen


On my Jupyter notebook the following function solves it:
 
```
def weightedMean(X, W):  
     # Write your code here  
     dotprd=sum([x*w for (x,w) in zip(X,W)])  
     return dotprd/sum(W)
```


However, on the site of the challenge, my function returns nothing... 


> ~ no response on stdout ~

why is that?
Top Answer
Tejas Shetty 
You need to call your function after defining it.
```
def weightedMean(X, W):  
     # Write your code here  
     dotprd=sum([x*w for (x,w) in zip(X,W)])  
     return dotprd/sum(W)
  
X1 = [1, 3 ,5, 78, 39] 
W1 = [0.1, 0.34, 0.49, 0.06, 0.01]

weightedMean(X1, W1)

```
will result in 
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