You cannot - except in very trivial cases.
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The average of a set of numbers is defined as the sum of those numbers divided by the number of numbers. If the average is given, multiply that by number of items in the set including the missing number. Subtract the sum of given numbers from this quotient and the missing number is revealed.
How do you find missed frequency if median and mode are given
-- Collect all of the information you're given ... such as the dimensions of the circle or of additional lines drawn inside the circle or touching it, and the size of other angles that are not missing. -- Recall and collect the various laws, relations, and formulas you know that relate to circles, or to whatever other shapes have been added to the drawing you have of the circle with the missing angle. -- Identify one or two of the mathematical or geometric operations you know that can make the connection between the given information and the missing angle.
That would depend on the plus or minus values of the given terms and whether or not an equality sign is missing none of which have been given
9.49 or 8.49, depending on which sides of the triangle the given values relate to.