Question

write the formula of class mark
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Answer 1

Answer:

The average of the class limits is (180 + 199) / 2 = 189.5. ... You might see the class mark defined as the average of the class boundaries as well. You'll get the same result. The same bin might have class boundaries of 179.5, 199.5, giving (179.5 + 199.5) / 2 = 189.5.

Answer 2

Answer:

class marks = upper limit + lower limit ÷2