exam Maths Puzzle Numerical Ability

i need help not with the answer being gave but how to do it all together.
What is the average (arithmetic mean) of 8, 7, 7, 5, 3, 2 and 2?

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exam Other Question

Describe the transformations on the following graph of . State the placement of the horizontal asymptote and y-intercept after the transformation. For example, left 1 or rotated a Write the equation of the line L satisfying the given geometric conditions.
L has y-intercept (0,2) and is perpendicular to the line with equation
2x - 3y = 6