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hello welcome to my channel alright so uh in todays video we try to look at uh 2020 uh statistic exam question all right so uh under this question there are formulas youre given formulas on the first page once you just open the present paper you are given the formulas to use so ive decided to use this formula its there ive just picked this formula to answer the question because its uh way easier to answer using this formula all right okay so lets try to study the formula we check out the way it looks here where its written x bar squared this x bar means its uh the mean squared this is mean squared and then the formula for finding mean it looks like what is here over here but you just remove this power here it means youre finding the mean okay so this is what we are basically going to do so lets look at the table the number of pps or students which were involved was 30 so we know that when we add these numbers down here it will give or they give us a 30. so the first thing w