The table below shows a frequency distribution of marks for 400 students in computer programming in a faculty of science. Determine the percentage of students whose marks are at least 50 but ?less than 90 Marks 10-19 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99 Number of Students 14 46 58 76 68 62 48 22 6 45% 50% 30% 80%

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