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The marks scored by 20 students in a test are given below:
84, 57, 53, 89, 41, 57, 47, 64, 58, 44, 53, 72, 51, 78, 71, 62, 56, 68, 54, 42

Complete the following frequency table:

(i) What is the upper limit of 40–50?
(ii) What is the upper limit of 70–80?
(iii) What is the class size?

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