Question: 
Write a python function to find the frequency of a number in a given array.


Model's Code:
def frequency(arr, num):
    return arr.count(num)



Sample Correct Code:
def frequency(a,x): 
    count = 0  
    for i in a: 
        if i == x: count += 1
    return count 


Asserts:
assert frequency([1,2,3],4) == 0
assert frequency([1,2,2,3,3,3,4],3) == 3
assert frequency([0,1,2,3,1,2],1) == 2


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 168 of 974: 123/168 (73.21428571428571%): success