It’s an isosceles triangle, so those two sides are equal:
3x-15=x+33
2x=48
x=24, so BC should be 24.
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1 3/4 would be your answer
To make your fraction while you would add 3/4 to get 2 and the add one to get 3
So you answer would be 1 3/4
The more times you do a test, the more accurate the results will be.
Since there are only 2 options/sides the probability should be 1/2 for both heads and tails.
Her error was both mathematical (her experimental probability number didn't make sense) and her lack of sufficient testing.