Can't find a proble here

[cvsae]

def ex10():
       mark1 = int(input("Insert math score"))
       mark2 = int(input("Insert Computer Science score"))
       mark3 = int(input("Insert physics score"))
       avg = float(mark1+mark2+mark3)/3
       print ((“avg=”,avg))
ex10()

I get erorr code, avg is not reognized
"invalid character identifier"
Please advice

at line 6 use " instead of “

def ex10():
       mark1 = int(input("Insert math score"))
       mark2 = int(input("Insert Computer Science score"))
       mark3 = int(input("Insert physics score"))
       avg = float(mark1+mark2+mark3)/3
       print ("avg=",avg)
ex10()