WT Cheng's answer to Syarifah's Secondary 4 E Maths Singapore question.
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Hi Syarifah, from above graph,
(b)
Q1 percentile with c.freq @15 (25% x 60) = 47 marks
Q3 percentile with c.freq @ 45 (75% x 60) = 67 marks
Hence interquartile range:
67 - 47 = 20 marks
(c)
20th percentile with c.freq @12 (20% x 60) = 45 marks
80th percentile with c.freq @48 (80% x 60) =70 marks
(b)
Q1 percentile with c.freq @15 (25% x 60) = 47 marks
Q3 percentile with c.freq @ 45 (75% x 60) = 67 marks
Hence interquartile range:
67 - 47 = 20 marks
(c)
20th percentile with c.freq @12 (20% x 60) = 45 marks
80th percentile with c.freq @48 (80% x 60) =70 marks
Date Posted:
3 years ago
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