Word Count : 236

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To find the number of students who obtained less than 45 marks, we use interpolation within the class interval 40–50, because 45 lies between 40 and 50. --- ### Step 1: Cumulative Frequency Table | Class Interval | Frequency (f) | Cumulative Frequency (CF) | | -------------- | ------------- | ------------------------- | | 30 – 40 | 31 | _____ _______ _____ ________ _______ ____ ___ _______ _________ ______.
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