New to Coding - Python homework help please

Question

I can do the math but implementing it into python has been a struggle for me:

def mean_and_std(sample): #create variables for mean and std from a sample

mean = #COMPLETE THIS LINE
std = #COMPLETE THIS LINE
return mean, std 

def validation(sample, cutoff): #get mean and std from the previous function and return the new mean #with precision of 2 decimal points

while True:
    mean, std = #COMPLETE THIS LINE
    
    outliers = 0
    for x in sample:
        if #COMPLETE THIS CONDITION:
            print(x)
            sample.remove(x) 
            outliers += 1
    #you can see here the variables to understand what you have        
    #print(mean,std, outliers)

    if #COMPLETE THIS CONDITION:
        break
    
new_mean, new_std = #COMPLETE THIS LINE
        
return #return the new mean - ROUNDED