Answer: it is In step 2, he confused the multiplication and addition signs mark me brainlyest please
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Let the missing number be x
Mean is the total sum of data over the number of data therefore,
(11+20+x+3+1) / 5 = 9
Then simplify
(35 + x) / 5 = 9
Then multiply 5 to both sides
35 + x = 45
Then subtract 35 to both sides to find x
X= 10
Hope this helps!
When adding fractions you need to get common denominators then you multiply too times bottom and then boom add and there you go